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Ornithorhynchus differs from Macropus and Pteropus by the

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absence of hair

oviparous mode of reproduction

presence of pinna

absence of mammary glands

answer is B.

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Detailed 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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