Animals living in water bodies need modifications to help them breathe easily and swim effortlessly.
Fish
The body of a fish has several specialized features.
● Gills
They take in the dissolved oxygen and help in breathing.
● Streamlined body
Streamlined body means having tapering ends and a bulged centre. This shape helps the fish to overcome the resistance of water and they can cut through it easily.
● Lateral line sense organs
Fish have organs for sensing vibration in the water on both sides of their body from head to tail.
● Fins
Fish have both paired and unpaired fins that help them to maintain their depth, stability, and control locomotion.