Which animal has a top shell called a ''carapace'', and a bottom called a ''plastron''?

great info !

Thank you for the information, it's more than I knew when I started out the day and that's a good day! Kind of the whole point of life. Have good days, give good days, the best you can! ❤

This information is great for people who have young children who want one for a pet.

Does the other 3 have soft and hard shells top and bottom