What are features of aquatic?

The characteristics of aquatic animals are as follows:

1. Most of their Species live in water and some of them live on the land

2. They have paired and unpaired fins which help them to swim.

3. They have either webbed limbs or limbs are modified to paddles for swimming.

4. Their body shape is streamlined and their bones are light and spongy.

5. The skull undergoes modification to form a slender snout.

6.The neck is reduced and external ears are disappeared.