Multiple choice

Which one of the following is a mammalian character without any exception?

  1. Diaphragm

  2. Hair

  3. Teeth

  4. Mammary glands
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Mammary glands are the defining characteristic of all mammals, giving the class its name. While some mammals like whales have lost hair (option B) and there are other exceptions to features like the diaphragm or teeth, mammary glands are universal in mammals.

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