Multiple choice

Which of the following is not a characteristic feature of mammals?

  1. Sweat glands for regulation of body temperature

  2. Scrotal sac lies external to the abdomen

  3. Well developed skeletal system

  4. External reproduction

  5. Endothermic
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In mammals, reproduction is internal as the ovum is fertilized in the oviducts.

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