First slide

Classification of Animals

Question

Ornithorhynchus differs from Macropus and Pteropus by the

Difficult

A

absence of hair
B

oviparous mode of reproduction
C

presence of pinna
D

absence of mammary glands

Solution

Prototherians (e.g., Ornithorhynchus) are oviparous whereas metatherians (e.g., Macropus) and eutherians (e.g., Pteropus) are viviparous. Prototherians lack pinna. Hair and mammary glands are present in all mammals.

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