Which of the following is true about kangaroo rat?

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It has a thick layer of fat called blubber.

It excretes concentrated urine.

It has four equal-sized limbs.

It has antifreeze proteins in its blood.

answer is B.

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Detailed Solution

The kangaroo rat in North American deserts is capable of meeting all its water requirements through its internal fat oxidation (in which water is a by product). It also has the ability to concentrate its urine so that minimal volume of water is used to remove excretory products. The hindlimbs of kangaroo rats are larger to enable leaping in these organisms. Also, kangaroo rats are nocturnal.In the polar seas, aquatic mammals like seals have a thick layer of fat (blubber) below their skin that acts as an insulator and reduces loss of body heat.

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