Explanation:

- Animals and plants which live in water:

- The suitable word to describe them is “Aquatic.”

- Option 1: Amphibian

- Amphibians are animals that can live both on land and in water.

- Examples include frogs and salamanders.

- Option 2: Aquatic

- Aquatic refers to organisms that live in water.

- This includes both animals and plants like fish, algae, and seaweed.

- Correct Answer

- Option 3: Terrestrial

- Terrestrial refers to organisms that live on land.

- Examples are humans, elephants, and trees.

- Option 4: Aerial

- Aerial pertains to organisms that live or operate in the air.

- Birds and some insects are examples.