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Subject :IEO    Class : Class 4

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Subject :IEO    Class : Class 4

Read the passage and answer the questions that follow.
Every winter, hundreds of humpback whales migrate long distances from their high latitude feeding grounds in the Arctic and Antarctic to warmer tropical regions to breed and give birth. The newborn calves, which drink over 52 gallons of milk every day, have only a few months to gain the body fat needed to keep swimming back to cooler waters in summer. How the babies signal hunger and avoid predators during these early months has always been a mystery to scientists.
"We know next to nothing about the early life stages of whales in the wild, but they are important for the calves' survival during the long migration to their feeding grounds," says study lead author Simone Videsen of the University of Aarhus, Denmark. "These early life stages of wild whales are so confusing because they're an aquatic animal. We can't follow them around all the time to see what they're doing."
Studies revealed that instead of crying loudly like their human counterparts, humpback calves signal their hunger by gently nudging their mothers or uttering soft grunts and squeaks. The moms answer the requests by responding with quiet calls.
The team believes these quiet conversations help whale mother keep track of their young in murky waters without being overheard by dangerous threats. According to Videsen, "Potential predators, such as killer whales could listen to their conversations and use that as a clue to locate the calf and attack on it."
The scientists think that the low audible conversation also keeps mate-seeking males at bay, allowing the females to focus on nurturing the newborns before the tough, 5,000-mile journey back to the feeding grounds in the Antarctic.
The early months of the humpback whale babies are a mystery because ___________.

Athere have been very few sightings of these whales
Bthey are aquatic animals and it's difficult to follow and study them around
Cthey are big creatures


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Subject :IEO    Class : Class 6

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Subject :IEO    Class : Class 5

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Subject :IEO    Class : Class 8

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Subject :IEO    Class : Class 6

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Subject :IEO    Class : Class 2

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Subject :IEO    Class : Class 2

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Subject :IEO    Class : Class 3

Read the passage and answer the question that Follow.

Palaeontologists in Egypt have discovered a 43-million-year-old fossil of a whale species with four legs that would have been capable of walking on land as well as hunting in water.
The previously unknown species belongs to the Protecetidae, a group of extinct creatures that were part of an evolutionary change in which mammals went from being land-dwelling herbivores to sea-dwelling carnivores over 10 million years.
The 3 m-long predator has been named ‘Phiomicetus anubis' after the ancient Egyptian God of death, not just for its assumed hunting abilities but also because its skull resembles the God's jackal head.
Weighing about 600 kg, it had powerful jaw muscles and amphibious skills that would have let it prey upon creatures such as crocodiles and small mammals, as well as the calves of other whale species, the researchers said.
"It was a successful, active predator," said Abdullah Gohar, a graduate student of vertebrate palaeontology at Mansoura University. "I think it was the god of death for most animals that lived alongside it."
The researchers spent over a decade studying fossilised fragments found in an area in the Fayum Depression southwest of Cairo that is known as the Valley of the Whales because of the marine fossils unearthed there.


Over 10 million years ago ___________ occurred.

Aextinction of animals
Bend of land-dwelling animals
Can evolutionary change
Dbirth of sea-dwelling animals


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Subject :IEO    Class : Class 2

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