Whale is placed in mammals and not in pisces because it:

Is aquatic in habit.

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Does not have fins.

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Respires through gills.

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Possess mammary glands.

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Solution

The correct option is D Possess mammary glands.
Although whales are aquatic creatures, spending all their time in the sea, they are indeed mammals because they give birth to live offspring (whereas Pisces hatch their young from eggs) and feed their young ones on milk produced by the mammary glands.
Thus, the correct answer is option D.

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Similar questions

Given below is a list of ten animals each followed by three terms or features. Underline the term which does not match with the animal.

(i) Amoeba - Nucleus, tentacle, food vacuole.

(ii) Hydra - Invertebrata, Cnidaria, Crustacea.

(iii) Fish - Gills, paired fins, ear drum.

(iv) Earthworm - Invertebrata, Annelida, Insecta.

(v) Grasshopper - Wings, trachea, proboscis.

(vi) Butterfly - Insecta, Invertebrata, Mollusca.

(vii) Whale - Gills, mammary glands, fat under the skin.

(viii) Pigeon - Feathers, wings, hair.

(ix) Monkey - External ear, sweat glands, lateral line.

(x) Bat - Aves, Mammalia, Chordata.

Why do female mammals possess functional mammary glands?

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