Fish

1. Aquatic animals

1.1. in the sea & in fresh water

1.2. covered with scales, have gills, fins & tail fins

1.3. can lay eggs that are fertilized internally or externally

2. Survival

2.1. usually swim in shoals or schools

2.2. to protect themselves from predators

3. Body

3.1. streamline body is tapered at both ends

3.2. allows them to swim rapidly

3.3. through mountain streams or

3.4. in the deepest depths of ocean

4. Gills

4.1. take in oxygen from water

5. Tail fins

5.1. helps to propel them faster

5.2. to escape from predators

5.3. to hunt for preys