How are seashells created? Or any other shell, such as a snail's or a ...

How are seashells created? Or any other shell, such as a snail's or a ...

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日期:2026-04-22
23 Oct 2006 ... These shells, unlike typical animal structures, are not made up of cells. ... the protein matrix of bone and seashell is secreted out of the cells....看更多