But Why: A Podcast for Curious Kids cover image

Why do sharks have so many teeth?

But Why: A Podcast for Curious Kids

CHAPTER

Do Sharks Sleep?

We do know that sharks m can go through periods of rest. Different species have different needs. Some species can lay on the bottom and respire or breathe by what's called bucle pumping. Other species have to move continuously in order to force the water over their gills, cause they can't suck it in themselves.

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