Multiple choice

Which of the following is the characteristic feature of amphibians?

  1. Scaly skin

  2. Two chambered heart

  3. Mucus glands

  4. Aquatic habitat
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Mucus glands are a characteristic feature of amphibians, keeping their permeable skin moist for cutaneous respiration. Amphibians have three-chambered hearts (not two-chambered), lack scales, and while many live near water, they are not exclusively aquatic. The mucus secretion is essential for their skin function and protection.

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