2min chapter

SciShow Tangents cover image

Shells

SciShow Tangents

CHAPTER

The Variety of Shells

A shell is a hard casing or covering in some sort and they can be made out of all kinds of things. There are plenty of calcium-based shells. Shells can be keratin in the case of like a, I think, an armadillo. Do my fingers have shells? I think they do. Is your skull a shell of a type?

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