Are dolphins and whales a type of fish?

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Are dolphins and whales a type of fish?

 Dolphins and whales are not fish. Fish is any cold- blooded (poikilothermic) vertebrate animal that lives in water. A fish typically has jaws, fins, scales, a slender body, a two-chambered heart, ahd gills for providing
oxygen to the blood. Fish is capable of breathing undentvater without making frequent trips to the surface to -breathe air like marine mammals. This is due to the fact that fishes have a breathing organ known as gills. This is made up of thin feathery sheets of tissue membrane containing many blood vessels through which the
oxygen passes, allowing the fishes to breathe.•ln other words, fish use their E gills to extract oxygen from the surrounding water in which they live.
Dolphins and whales, on the other hand, are mammals, just like humans; they breathe air using their lungs, they give birth to their young ones (rather than laying eggs), and feed their young with their milki They do noet have gills and get the oxygen they need by breathing air, using their lungs. This explains why they come to the surface of the ocean. They have a hole
(their nose) in the flat part of the middle of their heads called blow holes, This clo•ses when the whale or dolphin is underwater, and it opens when they are at the surface and need to breathe.

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