Question

Which one of the following characters is not typical of mammals?

• A. Presence of mammary glands
• B. Presence of hair
• C. Presence of neck
• D. Mammals are viviparous animals.

Answer 1

The correct option is C Presence of neck

Mammals have some key characteristic features like:

1) They are warm-blooded animals

2) They have four-chambered hearts.

3) They have mammary glands.

4) They possess hair on their body.

5) They are viviparous animals which means they give birth to young ones directly (Platypus is an exception).

The presence of the neck is not a typical characteristic of mammals because the neck is present in many other animals like some birds, reptiles, etc.
Thus, the correct answer is option C.