Question

whale do not have gills but they are water animals.how do they breathe​

Answer 1

Whales cannot breathe underwater because they are mammals and not fish. This means that their breathing organs are lungs, rather than gills. So, like humans, whales need to come to the surface to take a deep breath of fresh air and when they are underwater they hold their breath.

Answer 2

They have greater lung capacities. So they are able to stay under water for long hours. After some time they come on surface to breathe and breathe through the hole present on their back..