How does dolphin or whale breathe ?

Mention one adaptation present in the following animals: In dolphins and whales to breathe in air when they swim near the surface of water.

Dolphins and whales communicate under water using sound. They can see each other with their eyes and also by producing sound. Dolphins and whales are able to communicate in water because sound

Whale is

State whether the following statements are true or false : whales and dolphins live in water and breathe through gills.