Multiple choice

Which of the following is a characteristic feature of mammals?

  1. Warm blooded

  2. Respiration through lungs

  3. Presence of mammary glands

  4. Four chambered heart
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Mammary glands are the defining characteristic feature of mammals, which produce milk to nourish their young. While mammals are indeed warm-blooded, have four-chambered hearts, and breathe through lungs, these traits are also found in other animal groups (birds are warm-blooded with four-chambered hearts). Only mammary glands are unique to mammals.

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