Tortoise having shell on their body …
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Meghna Thapar 5 years, 5 months ago
There are three layers in the shell of P. fucata: the outer periostracum layer, the middle prismatic layer and the inner nacreous layer. Mollusk shells are made of a chalky material called calcium carbonate. The shell has three layers for extra strength: a tough outer layer, a chalky middle layer, and a shiny inner layer, next to the animal's skin. The shiny layer in some bivalve mollusks is known as mother-of-pearl.
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