Whales and dolphins are mammals, not fish. Fish are covered with scales and breathe through gills. Mammals are covered with hair and breathe through lungs.
Wait, whales and dolphins have lungs? How do they breathe in water?
Well, they don’t. Whales and dolphins breathe through a hole at the top of their heads called a blowhole. The blowhole is so efficient it can empty and refill their lungs in 1/5 of a second. And, because they breathe air, they have to hold their breaths. Dolphins can hold their breaths for up to 20 minutes while some whales can do that for up to 90 minutes!
And because they are air-breathers, as incredible as it sounds, dolphins and whales can actually drown!
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Experiment #7 - Forces (Frictional Force)
Experiment #6 - Forces (Frictional Force)
Experiment #5 - Forces (Interactions)