Mention the features of fish for adaptation to aquatic ecosystem.

Explanation

### Step-by-Step Text Solution:

1. **Streamlined Body**: Fish have a streamlined body shape that reduces resistance while swimming. This adaptation allows them to move efficiently through water, making it easier to catch prey and escape predators.

2. **Scales**: The skin of fish is covered with scales that serve multiple purposes. These scales provide protection against physical injuries and parasites, and they also help prevent water loss, keeping the fish healthy in its aquatic environment.

3. **Gills**: Fish possess gills, which are specialized organs that allow them to extract oxygen from water. Unlike humans, who have lungs for breathing air, fish use gills to breathe underwater, enabling them to survive in their aquatic habitat.

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