Animals that live in water. They have gills to breathe underwater and fins to help them swim. Most of them lay eggs in water. Some fish, like guppies, give birth to live young instead of laying eggs.

Example

1. They breathe through their gills and use fins to swim.
2. Most fish are cold-blooded and their body temperature changes with the water temperature.
3. Fish use their fins for balance, steering, and propulsion. water temperature.