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Turtles have a two-part shell, the carapace on top and the plastron underneath.
The parts are linked by bony structures between the front and back feet. The shell grows with the turtle and is derived from bones in the body. Hard-shelled turtles usually shed scutes as they grow. They come off in papery layers, one at a time, and are replaced by larger ones. New questions are answered on the site every Tuesday and Thursday.