Turtle carapace has become the ribs and horny.
Turtle has a rib is met between them to form the outside of the body to the horny shell.
Of course, before the turtle also the evolution, spine and ribs like normal reptiles there was on the inside of the body.
Carapace of the turtle, which consists of ribs and cartilage tissue can not be taken as a cartoon. Skin, because is connected to the internal organs. If the turtle is take off the shell, die.
Turtle carapace is originally was a rib - of turtle carapace evolution
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