[Answer] 10. Whales are a kind of:

Step 1 : Introduction to the question "10. Whales are a kind of:"

...1. fish 2. shark 3. amphibian 4. mammal They were recognized as mammals in 1758 by the Swedish biologist Linnaeus. Mammals give birth to live young, have hair, are warm-blooded, all traits that whales share, even down to stubble-like hair that many species have on their snouts.

Step 2 : Answer to the question "10. Whales are a kind of:"

mammal:

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