(i) How do dolphins breathe?

(ii) Do snails have lungs for respiration? How do they breathe?

Asked by Topperlearning User | 4th Jun, 2014, 01:23: PM

Expert Answer:

(i) Although the dolphins possess lungs, they breathe through their blowholes. Powerful muscles form a special plug within the blowhole which prevents water from entering the lungs when the dolphin is underwater. Dolphins have to rise to the surface of water frequently to breathe. When they are underwater, they hold their breath; when they are out of breath, they return to the surface to take in more fresh air.

(ii) No, snails do not possess lungs. They respire through their skin.

Answered by  | 4th Jun, 2014, 03:23: PM