
Explanation: When a turtle retracts its neck into its shell, its spine retracts into an S-shape. The turtle's shell is similar to our human ribs, spine, and sternum. Because of this, turtles cannot shed or separate their shells.

Explanation: When a turtle retracts its neck into its shell, its spine retracts into an S-shape. The turtle's shell is similar to our human ribs, spine, and sternum. Because of this, turtles cannot shed or separate their shells.