Read the passage and answer the questions.
Description: The Great White Shark is the largest predatory shark, and is probably the most well-known and feared shark. The Great White Shark is gray or bluish above and white below. The largest Great Whites can reach lengths of 22 feet and weigh up to 5,000 pounds. Most are between 13 and 16 feet and weigh 1,500-2,400 pounds. The Great White has massive teeth, which are positioned in rows and serrated. When the Great White attacks, it bites its prey and shakes it head back and forth. The serrated teeth act as a saw and literally tear the victim apart. The Great White Shark often swallows many of its own teeth in an attack.
Diet: The Great White Shark normally feeds on fish, seals, dolphins, porpoises, otters, and turtles. It is thought to locate its prey by electrosense and by smell. Like all sharks, Great Whites have special pores called Ampullae of Lorenzini, which enable them to detect the electromagnetic fields radiated by moving organisms. Great Whites can detect voltage as small as one half billionth of a volt.
Great Whites employ several hunting techniques depending on the prey. Most of the time, the shark will remain still underwater before ambushing its prey from underneath. In the case of hunting some kinds of seals, the impact of the shark is so powerful that it knocks both the shark and the seal clear out of the water. With larger prey such as elephant seals, the shark will simply take a huge bite out of it and wait for it to bleed to death. When hunting dolphins, the shark will attack from above, presumably to avoid detection from the dolphin's echolocation.
Range/Habitat: Great White Sharks are most commonly observed throughout the world's sub-arctic coastal waters, though they likely spend most of their time in the open ocean. Highest concentrations are found in the waters off the coast of South Africa, Australia, California, and Mexico. The Great White Shark is also found in the Adriatic and Mediterranean Seas. They generally prefer water between 54 and 75 degrees Fahrenheit.
Reproduction: A Great White Shark has never been observed giving birth, however pregnant females have been caught. The Great White Shark is known to be ovoviviparous (young develop in eggs within the mother's body). Females give birth to eight or nine pups that are about five feet in length upon birth. Great Whites reach reproductive maturity when the male is about 12 feet long and the female about 13 feet long. It is thought that Great White Sharks live up to 40 years in the wild, but this estimate may be too low.
Shark Attacks: Despite the fear of Great White Sharks, at least in part generated by Steven Spielberg's 1975 movie, Jaws, Great White Sharks do not target humans as prey. Most attacks are attributed to mistaken identity. Sharks can easily mistake humans for seals. Many human injuries caused by Great White Sharks are cases of test-biting. If a shark is unsure about a floating object, it often gives it a test bite to determine what kind of object it is. While such bites do little damage to buoys and other objects, they obviously can inflict serious damage on the human body.
Show questions one by one
Last Question 1 / 10Next Question
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Which of the following is least likely?
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? Finding a 15 foot long Great White Shark.
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? Find a Great White Shark hunting a porpoise
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? Finding a Great White Shark in 85 degree (Fahrenheit) water.
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? Find a Great White Shark that weighs 2,000 pounds
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The maximum weight of MOST Great White Sharks is ____________ pounds.
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? 4,200
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? 5,000
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? 2,400
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? 24,000
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Select all of the following that are normal parts of the Great White Shark's diet.
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Humans
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Fish
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Dolphins
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Seals
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Check
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The ___________________________ are specialized pores that allow a shark to detect magnetic fields of moving organisms.
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? Ampullae of Lorenzini
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? Echolocation
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? Serrations
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? Electomagnets
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What does ovoviviparous mean?
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? It refers to animals that lay eggs
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? It refers to animals that do not lay eggs
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? It refers to animals whose young develop in eggs within the mother's body.
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? It refers to animals whose young develop outside the mother's body.
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You would have something in common with the Great White Shark if you.....
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? spend most of your time near the shore
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? have four brothers and four sisters
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? located your food by sound
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? lived to be 80 years old
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In which of the following places would you have the best chance to see a Great White Shark?
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? Mediterranean Sea
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? coastal South Africa
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? Antarctica
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? Mississippi River
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Sharks often mistake humans for _________________.
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Check
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Which of the following is NOT true?
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? Great White Sharks often target humans as prey.
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? Great White Sharks employ different hunting techniques depending on the prey they are stalking.
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? Great White Sharks swallow their own teeth during attacks.
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? Great White Sharks can detect prey by smell or by magnetic field.
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Which of the following may or may not be true?
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? Newborn Great White Sharks are about five feet in length.
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? Great White Sharks have a life span of 40 years.
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? The Great White Shark is actually only white on its underparts.
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? Great White Sharks have serrated teeth that act like saws.
OK
Read the passage and answer the questions.
Description: The Loggerhead Sea Turtle is named for its large head and blunt jaw. This huge sea turtle can grow to 800 pounds (though the average turtle is about 200 pounds) and three and a half feet in length. It is the largest hard-shelled turtle in the world. The carapace (shell) and flippers are reddish brown and the plastron (lower shell) is yellowish. The carapace has five lateral scutes and five central scutes. Scutes are hexagonal sections of the carapace. Underparts are white or whitish. These incredible turtles have powerful flippers that can propel them through the water at speeds of up to 16 miles per hour. The Loggerhead Sea Turtle has a life span of up to 50 years in the wild.
Habitat/Range: The seafaring Loggerhead Sea Turtle is found throughout the world's tropical oceans. They are also found in temperate waters in search of food and in migration. Breeding populations exist in many locales including the Atlantic coast of the United States (from North Carolina to Florida), numerous Caribbean islands, Central America, the Mediterranean Sea, and Africa.
Diet: Loggerhead Sea Turtles consume fish, crustaceans, mollusks, crabs, and jellyfish, They use their powerful jaws to crush prey. These turtles often ingest stray plastic bags which are mistaken for jellyfish and which cause potentially fatal complications.
Nesting: The Female Loggerhead Sea Turtle normally lays her eggs on the same beach in which she was born. It may take up to 30 years before these turtles reach reproductive age. In June or July, females will emerge from the ocean and dig a hole in the sand. Between 70 and 150 eggs are deposited in the hole. The female uses her hind flippers to cover the hole. The eggs are about the size of ping pong balls. Eggs hatch within 65 days. Young turtles instinctively head toward the ocean upon hatching (which reflects the moonlight). Many of these young turtles are taken as prey by opportunistic gulls, vultures, and raccoons. Others are led in the wrong direction by lights from roads and beach houses which the turtles mistake as moonlight. Those that are fortunate enough to make it to the water are swept toward the open ocean by waves and sea currents.
Show questions one by one
Last Question 1 / 10Next Question
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Why is this species named Loggerhead Sea Turtle?
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? It has a large head.
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? It rests its head on logs.
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? It hunts on logs.
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? No one knows.
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What shape are scutes?
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? octagonal
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? hexagonal
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? square
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? diamond
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Which of the following is not part of the turtle's shell?
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? tail
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? scute
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? carapace
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? plastron
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Which of the following is NOT true?
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? Loggerhead Sea Turtles are negatively affected by trash that makes its way into the sea.
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? Loggerhead Sea Turtles can live 50 years.
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? There are no hard-shelled turtles larger than the Loggerhead Sea Turtle.
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? Baby Loggerhead Sea Turtle, by instinct, stray away from light when they hatch.
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Loggerhead Sea Turtles DO NOT eat...
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? crabs
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? molluscs
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? dolphins
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? jellyfish
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Where would you most likely NOT see a Loggerhead Sea Turtle?
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? Off the coast of Africa.
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? In the ocean near South Carolina
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? In Lake Michigan
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? In the Caribbean Sea
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Where do female Loggerhead Sea Turtles lay eggs?
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? At the bottom of the ocean.
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? On gravel surfaces away from the beach.
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? On the beach in which she was born.
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? On any beach that does not have people.
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What does the word "fatal" mean in the following sentence?
These turtles often ingest stray plastic bags which are mistaken for jellyfish and which cause potentially fatal complications.
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? annoying
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? deadly
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? painful
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? confusing
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What does the word "emerge" mean in the following sentence?
In June or July, females will emerge from the ocean and dig a hole in the sand. Between 70 and 150 eggs are deposited in the hole.
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? return to
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? swim away from
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? give birth in
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? come from
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Which is not true about Loggerhead Sea Turtle eggs?
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? They are shaped liked ping pong balls
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? They are laid in the sand
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? They are poisonous to predators
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? They hatch within 65 days
OK
Read the passage and answer the questions.
Description: The Emperor Penguin is the world's largest and tallest penguin. It is also the heaviest penguin, with some individuals recorded at nearly 100 pounds. Adults have a black head, back, tail, and black wings. The underparts are dingy white. The sides of the neck are marked with a large golden or yellow stripe. In addition, there is a varying amount of gold on the upper breast. Like most penguins, the Emperor Penguin has thick, waterproof feathers that cover the entire body except for the bill and feet. Emperor Penguins normally live about 20 years in the wild, though some individuals have been recorded at 40 years of age.
Diet: Crustaceans, krill, and small fish. Emperor Penguins will dive to depths of 800 feet in search of food. Most dives last 3-6 minutes.
Predators: Sharks, Leopard Seals, Orcas. Chicks are vulnerable to predation from South Polar Skuas.
Range: The Emperor Penguin is found throughout the Antarctic perimeter. It is the only species of penguin to breed during the Antarctic winter. Breeding takes place about 60 miles from the coast in the Antarctic interior, where temperatures regularly drop to -40 degrees Celsius. The trek from the Antarctic coastline to the breeding grounds was the inspiration for "March of the Penguins".
Nesting: Female Emperor Penguins lay a single egg in May or June. After the egg has been laid, the female must immediately feed in the ocean. First, the egg is carefully transported to the male, who incubates the egg under a brood patch that rests above the feet. Occasionally, the transfer is unsuccessful and the egg rolls onto the ice and instantaneously freezes.
The male will incubate the egg for up to 65 days! During this time, he will not eat a single meal. On particularly cold days, hundreds of male penguins may gather together in a compact huddle to warm themselves in the pounding Antarctic winds. In about two months, the female returns and locates her mate and chick by sound. She regurgitates food stored in her stomach to feed the growing chick. The male then takes his turn feeding in the ocean and returns after about a month, at which point both parents tend to the chick by regurgitating food and keeping it off the ice. Once the chick is about seven weeks old, it joins other chicks in a creche (huddle) to keep warm.
Status: Populations of Emperor Penguins are thought to be stable. Estimates indicate about 200,000 breeding pairs.
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Where do Emperor Penguins breed?
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? Along the coast
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? In the water
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? The Antarctic interior
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? South America
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At the end of the passage, a line reads "Populations of Emperor Penguins are thought to be stable. Estimates indicate about 200,000 breeding pairs." What does stable mean?
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? Increasing
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? Uncertain
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? Staying the same
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? Decreasing
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Which of the following scenarios is unlikely?
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? Finding an Emperor Penguin that weighs 80 pounds.
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? Finding an Emperor Penguins after it has been underwater for 10 minutes.
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? Finding an Emperor Penguin that is about 20 years old.
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? Finding an Orca that has just eaten an Emperor Penguin.
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Which of the following is NOT part of the diet of the Emperor Penguin?
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? crustaceans
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? insects
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? fish
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? krill
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Which of the following is NOT true?
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? Sometimes, the egg transfer from the female to male results in the egg freezing.
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? The female lays an egg during the Antarctic winter.
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? The male incubates for more than two months without eating.
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? After the female lays the egg, the male must immediately feed in the ocean.
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What color is the tail of the Emperor Penguin?
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? black
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? orange
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? yellow
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? white
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How many eggs are laid by the female Emperor Penguin?
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? 0
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? 1
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? 2
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? 3
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Which of the following animals only preys on Penguin chicks?
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? seals
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? skuas
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? orcas
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? sharks
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Select all of the following that are TRUE
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The female locates her chick by sound.
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Both parents will feed chicks by regurgitating food.
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After the egg is laid, the maleventures off to the sea first.
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The female locates her chick by sight.
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Check
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What happens third?
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? The egg transfer
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? The young penguin joins a creche.
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? The male feeds in the ocean while the female tends to the chick.
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? The female feeds in the ocean while the male incubates
OK
24:55
The Peregrine Falcon is a large, powerful falcon of seashores, mountain ranges, and the arctic tundra. Peregrine Falcons hunt medium to large sized birds, and are especially fond of ducks, shorebirds, and pigeons. Peregrine Falcons are extremely strong flyers, and often seize their prey at speeds of over 100 miles per hour. Some Peregrine Falcons have even been clocked at higher speeds while hunting.
The Peregrine Falcon could once be found throughout the United States. DDT, a chemical for controlling insects, caused the eastern population of Peregrine Falcons to crash. Peregrine Falcons, Bald Eagles, and other birds of prey would eat fish and ducks that were contaminated with the chemical. As DDT built up in the their bodies, such birds of prey would lay brittle eggs that would crack easily. In 1972, DDT was made illegal to use in America, and some birds of prey made a comeback. The Peregrine Falcon, however, did not.
Scientists took a different approach to the Peregrine Falcon. Since Peregrine's nest on mountain cliffs, scientists began capturing the falcons and relocating them to big cities with skyscrapers. The plan worked. Today the Peregrine Falcon is no longer an endangered species. Peregrines now thrive in Boston, New York City, Baltimore, and Pittsburgh. In those cities, they can have as many pigeons as they want.
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Where would the Peregrine Falcon not be found?
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? Rocky Mountains
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? California shore
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? Arctic tundra
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? Arizona desert
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Which of the following would the Peregrine Falcon likely not eat?
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? Wood Duck
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? Hummingbird
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? Pigeon
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? Shorebirds
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Some Peregrine Falcons have been clocked at speeds of more than ___________ miles per hour while ______________.
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? 100; hunting
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? 100; sleeping
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? 50; defending the nest
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? 50; chasing away predators
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Which of the following words would best describe DDT?
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? harmless
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? harmful
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? helpful
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? colorful
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Which of the following statements is true?
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? Unlike other birds of prey, the Peregrine Falcon made a comeback after DDT was made illegal.
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? Like other birds of prey, the Peregrine Falcon made a comeback after DDT was made illegal.
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? Unlike other birds of prey, the Peregrine Falcon did not make a comeback after DDT was made illegal.
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? Like other birds of prey, the Peregrine Falcon did not make a comeback after DDT was made illegal.
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What does brittle mean?
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? weak
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? strong
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? thick
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? hard
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How did scientists try to save the Peregrine Falcon?
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? They set aside land for them.
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? They captured them and brought them back to the mountains.
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? They captured them and released them in big cities.
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? They captured them and released them in skyscrapers.
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Which happened first?
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? DDT was made illegal.
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? Peregrine Falcons became endangered
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? Scientists brought them to live in big cities.
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? Peregrine Falcons were taken off of the endangered species list.
OK
24:55
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Alexander Graham Bell
Alexander Graham Bell was born in Edinburgh, Scotland on March 3, 1847. When he was only eleven years old, he invented a machine that could clean wheat. Graham studied anatomy and physiology at the University of London, but moved with his family to Quebec, Canada in 1870.
Bell soon moved to Boston, Massachusetts. In 1871, he began working with deaf people and published the system of Visible Hearing that was developed by his father. Visible Hearing illustrated how the tongue, lips, and throat are used to produce vocal sounds. In 1872, Bell founded a school for the deaf which soon became part of Boston University.
Alexander Graham Bell is best known for his invention of the telephone. While trying to discover the secret of transmitting multiple messages on a single wire, Bell heard the sound of a plucked string along some of the electrical wire. One of Bell's assistants, Thomas A. Watson, was trying to reactivate a telephone transmitter. After hearing the sound, Bell believed he could send the sound of a human voice over the wire. After receiving a patent on March 7, 1876 for transmitting sound along a single wire, he successfully transmitted human speech on March 10th. Bell's telephone patent was one of the most valuable patents ever issued. He started the Bell Telephone Company in 1877.
Bell went on to invent a precursor to the modern day air conditioner, and a device called a "photophone" that enabled sound to be transmitted on a beam of light and which today's fiber optic and laser communication systems are based. In 1898, Alexander Graham Bell and his son-in law took over the National Georgraphic Society and built it into one of the most recognized magazines in the world. Bell also helped found Science Magazine, one of the most respected research journals in the world.
Alexander Graham Bell died August 2, 1922. On the day of his burial, in honor of Bell, all telephone services in the United States were stopped for one minute.
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