Question

Whales are warm-blooded animals, which live in cold seas. Which part of its body helps in heat conservation?
A. Blubber
B. Pelage
C. Muscles
D. Blood vessels

Answer 1

Hint: Whales are warm-blooded creatures. All of these acts are done by whales! Whales are warm-blooded, which means they maintain a constant body temperature even in chilly water. Despite living in the ocean and being surrounded by cold-blooded species such as fish and sharks, whales are warm-blooded marine mammals.

Complete answer:
Whales evolved from land-dwelling mammals and must come to the surface to breathe air on a regular basis, despite their ability to stay submerged for long periods of time. Some species, such as the sperm whale, can spend up to 90 minutes underwater.
 On top of their heads, they have blowholes (modified nostrils) via which air is inhaled and exhaled. They have a coating of fat under their skin called blubber and are warm-blooded. Whales can travel at speeds of up to 20 knots because of their streamlined fusiform bodies and two modified arms that serve as flippers, albeit they are not as flexible or nimble as seals. Whales emit a wide range of vocalisations, including the humpback whale's long songs.
The thick blubber layer not only traps heat inside the body, but it also cools the outermost skin layer to the same temperature as the surrounding water, reducing heat even further.

Hence option A. is the correct answer.

Note:
The thick blubber layer not only traps heat inside the body, but it also cools the outermost skin layer to the same temperature as the surrounding water, reducing heat even further. Marine mammals use blubber to help them float or stay buoyant. Animals float naturally because their blubber is less dense than the ocean water around them.