Which characteristics can be used to define a | vedclass

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(D) Mammals (Class $Mammalia$) are characterized by several unique features that distinguish them from other vertebrates.$1$. The presence of hair on

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Both $A$ and $C$

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(D) Mammals (Class $Mammalia$) are characterized by several unique features that distinguish them from other vertebrates.$1$. The presence of hair on the skin is a unique characteristic of mammals.$2$. The presence of an external ear or pinna is also a characteristic feature of most mammals.$3$. Fins are characteristic of fish,not mammals.Therefore,both the presence of pinna and hair on the body are defining characteristics of mammals.

Which characteristics can be used to define a mammal?

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