Question

Exoskeleton is absent in:

• A. Fish
• B. Aves
• C. Mammals
• D. Amphibians

Answer 1

The correct option is D Amphibians

Exoskeleton is the external skeleton that supports and protects an animal's body

A. Fishes have an exoskelton of dermal scales.

B. Aves- It is covered by an epidermal horny exoskeleton of feathers.

C. Mammals- It is covered by a horny epidermal exoskeltopn of hair.

D. Amphibians- The skin is well vascular and is respiratory in most species. Scales are mostly absent.

So, the correct answer is 'Amphibians'.