Question

Which of the following are characteristics of aquatic animals?

• A. Aquatic animals have gills to breathe underwater.
  
• B. The neck is reduced and external ears are disappeared.
• C. Aquatic animals have streamlined body for effective navigation in water.
• D. None of the above.

Answer 1

Answer: (A), (B), (C)

The correct options are
A Aquatic animals have gills to breathe underwater.

B The neck is reduced and external ears are disappeared.
C Aquatic animals have streamlined body for effective navigation in water.

Aquatic animals are those animals which live in water. In a general consideration, these animals are classified based on their habitat.
Thus, aquatic animals belong to two groups; marine aquatic animals and freshwater aquatic animals.

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.