ID: A Why do most murine mammals have a thick layer of blubber? A. B. C. D. 8. t
ID: 271286 • Letter: I
Question
ID: A Why do most murine mammals have a thick layer of blubber? A. B. C. D. 8. to aid with buoyancy to maintain their high metabolism to provide insulation in cold waters to make eating unnecessary 9. The survival of polar bear populations are threatened due to.. -A. B. C. D. reducedd seal populations human poaching extreme ice and glacier melt chemical pollution in the Aretic Ocean 10. The flexible fibrous plates that allow for feeding in some whales is... A. baleen B. canine teeth C. gill slits D. gill arches 11. What is the largest living animal on Earth? A. Blue whale B. Humpback whale C. Megalodon D. Bowhead whale Short Answer Choose two of the following and answer in complete sentences 12. Explain why whales are threatened or endangered. 13. Compare and contrast manatees and dugongs. 14. Compare and contrast toothed and baleen whales. 15. Compare and contrast the different types of pinnipeds.Explanation / Answer
Hi Answer:
Q.8. Why do most of the marine mammals have a thick layer of bladder?
Answer: Option. C (To provide the insulation to cold water)
Explanation: In marine mammals the thick layer of bladder is made up of adipose tissue which act as the insulator and protect the animals from cold sea water.
Q9. The survival of polar bear population are threatened due to
Answer Option. C (extreme ice and glacier melt)
Explanation: As we know that the polar bear live in polar regions where ice is throughout the air but due to the global warming the ice of these regions also start melting which indicates the rise in temperature at polar regions too and this rise in temperature is not suitable for the polar bears so that’s why their population is threatened.
Q.10 The flexible fibrous plates that allow for feeding in some whales is….
Answer Option. A (Baleen)
Explanation: The whales is divided into two types according to their teeth’s. One is toothed whale and second is the toothless whale. The tooth less whale is known as Baleen whale and it has a row of flexible, fibrous plates on upper jaw which help in feeding.
Q.11 What is the largest living animal on earth
Answer Option. A. (Blue whale)
Explanation: Blue whale is the largest animal on earth and it belongs to baleen whale group. It’s up to 30 meter long and maximum recorded weight is 173 tonnes.
Q.12. Explain why whales are threatened or endangered.
Answer: The whales are endangered and there are number of factors such as overfishing, pollution, dam construction, boating and commercial whaling which make these whales’ endangered spices. The commercial whaling (killing) plays a major role in making whales as endangered animals.
Q.13.Compare and contrast mamatees and dugongs
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Q.14 Compare and contrast toothed and baleen whales
Q.15. Compare and contrast the different types of pinnipeds
Answer: Pinnipeds are commonly known as seals. These are fine footed animals and belongs to the superfamily of Carnivore order. They are bear like creature having slender and sleek bodies shaped like barrels.. They are mostly aquatic in nature. Its weight varies between 30 kg to 2000 kg.
Different type of seals: i. Walking seals 2. True seals 3. Walruses
1. Walking seal: Having ears and most common type are fur seals and sea lions. They can walsk on land and assumed as asocial animal. They have dog like snouts which differentiate them from others.
2. True seals: They are also without ear. They spend their whole life span in water and considered as perfect swimmer. They migrated to long distance. They look very clumsy on land,
3. Walruses: Are distinguished by their tusks and bulk that can sometimes exceed 2000 kg. They are the perfect blend of Walking and True seals. They are not able to turn their rare flippers into the forward direction but have whole body movement during swimming. They don’t have external ears. They feed on invertebrates, mollusks and adopt a special unique squirt and suck method of feeding
Features Dugongs mamatees Tail size Flukes with pointed projections like in whale Large, horizontal, paddle Nails No nails Essential nails on forelimbs of West African and West Indian manatees Nostrils placed further back on its head Nostrils of manatees are placed near the head Mouth More pronounced mouth Less pronounced mouth Teeth Pair if tusk-like incisors Don’t have incisors