Question

Sweat glands and external ears are characters of group:

• A. Birds
• B. Amphibians
• C. Reptiles
• D. Mammals

Answer 1

The correct option is D Mammals

Only mammals have external ears and sweat glands. These are present mainly for thermoregulation and excretory purposes.

Birds do not have external ears or sweat glands but have feathers for thermoregulation

Reptiles have ear-like structures but that cannot be counted as external ears.

Amphibians and Reptiles do not have sweat glands and external ears since they do have thermoregulatory mechanisms.

So the correct answer is 'Mammals'.