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Shark give birth to their young and why they are not mammals?

In: Fish, Mammals, Sharks [Edit categories]

Answer:

Mammals are mainly categorized as having hair, nursing their Young, and breathing with lungs. Sharks do not have hair, do not nurse their Young, and breathe using gills. Sharks are considered "cartilage fish".

*note: one deviation from it's normal class is not totally uncommon; after all, there are egg-laying mammals such as the platypus.

First answer by Sunderwoodbio. Last edit by Sunderwoodbio. Contributor trust: 17 [recommend contributor ]. Question popularity: 1 [recommend question].

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Relevant answers:

Does shark give birth to young?
it depends on the type of shark some sharks lay eggs which r known as mermaids purses and other sharks will give birth to live young
Do most mammals give birth to their young?
Most mammals give birth to their young. Only the monotremes - platypuses and echidnas - are egg-laying mammals.
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All mammals, with the exception of the monotremes, give birth to live young. Monotremes are egg-laying mammals, and comprise just three species: platypus, short-beaked echidna and long-beaked echidna.
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