First slide

Classification of Animals

Question

All mammals, without any exception, are characterised by

Difficult

A

viviparity and mammary glands
B

mammary glands and ear pinna
C

four-chambered heart and biconcave RBC
D

diaphragm and mammary glands

Solution

All mammals, without any exception, are characterised by the presence of a diaphragm and mammary glands. Most of them are viviparous but prototherians (e.g., platypus) are oviparous. Ear pinna is absent in prototherians (e.g., platypus), cetaceans (whales and dolphins) and sirenians (sea cows). RBC are elliptical in camels and llamas.

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