Both Birds and Mammals Are Endotherms

question 6

Multiple Choice

Both birds and mammals are endotherms.That is, both groups regulate their body temperatures from within.If both are "warm-blooded," then why are birds not considered mammals?

• A)Birds have wings, but mammals do not have wings.
• B)Birds do not possess mammary glands, a defining characteristic of mammals.
• C)Mammals procreate through sexual reproduction, but birds lay eggs.

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