The unique mammalian characteristics are:

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(C) The correct answer is $C$ because the presence of hairs,pinna,and mammary glands are unique features of mammals.$A$ is incorrect because mammals h

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hairs,pinna and mammary glands

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(C) The correct answer is $C$ because the presence of hairs,pinna,and mammary glands are unique features of mammals.$A$ is incorrect because mammals have a dicondylic skull,whereas a monocondylic skull is found in reptiles and aves.$B$ is incorrect because the tympanic membrane is also present in amphibians,so it is not a unique feature of mammals.$D$ is incorrect because mammals exhibit direct development,not indirect development.

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