All mammals:

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(C) The defining characteristic of the class $Mammalia$ is the presence of mammary glands,which are used to nourish their young with milk.While most m

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Nourish their young with milk

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(C) The defining characteristic of the class $Mammalia$ is the presence of mammary glands,which are used to nourish their young with milk.While most mammals give birth to live young,monotremes (like the platypus) lay eggs.Not all mammals have a thick coat of hair (e.g.,whales have very little hair).While most female mammals have a uterus,the primary diagnostic feature that defines the group is the presence of milk-producing glands.

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