that depends on what kind of tortoise or turtle you are talking about
A sea turtles shell stays on its back because its attached
its shell
A terrapin has a shell because it is a turtle, of course. There are 4kinds of turtles: aquatic turtles, land turtles, terrapins, and sea turtles. All turtles have shells.
to protect them from predators
sea turtle use there shell to fend off predators
because of there leather shell
No, sea turtles have skeletons just like you do; but they have an armored shell on top for protection.
plastron
No, because it has a big hard shell so, most animals can't eat it.
same color shell
By shrugging themselves into their shell.
One of the predators of the sea turtle is the tiger shark. People also eat turtles. If an animal can get through the turtle's shell, they will eat the turtle. The shell is the turtle's defense, among other uses. Gulls and crabs eat turtles.