Turtles are the only vertebrates with a complete shell. It is formed mainly of bone; the upper part is the domed carapace, while the underside is the flatter plastron.

Turtles are the only vertebrates with a complete shell. It is formed mainly of bone; the upper part is the domed carapace, while the underside is the flatter plastron.

Photo by naturelovers21

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Stock photo: Turtles are the only vertebrates with a complete shell. It is formed mainly of bone; the upper part is the domed carapace, while the underside is the flatter plastron. was taken by naturelovers21 .