Question

Identify the odd one out among the given options:

• A. Cow
• B. Dog
• C. Human
• D. Echidna

Answer 1

The correct option is D Echidna

Cow, dog, and human are viviparous organisms.

Viviparous organisms are those that give birth to young ones and feed them milk. They are also called mammals. They have hair on their body and have pinna.

Echidna is an oviparous organism among the mammals, i.e., it lays eggs and does not give birth to young ones. It feeds its young ones with its milk. So the odd one among the given options is the echidna.