Question

Why do whales and dolphins often come up to water surface?

Answer 1

Whales and dolphins use their lungs to breathe air also. That's one reasons why they come to the surface of the ocean.

Answer 2

Fish use their gills to take oxygen from the water that they live in. But people get the oxygen we need by breathing air, using our lungs. Whales and dolphins use their lungs to breathe air also. That's one reasons why they come to the surface of the ocean.