Cases of word usage

1) a small animal of South America with a shell of bony plates, able to roll itself into a ball when attacked (armadillo)

2) a water animal with a hinged double shell e.g. and oyster, a mussel (bivalve)

3) the shell on the back of a tortoise etc (carapace)

4) a kind of large shellfish, with a shell in two halves, used for food (clam)

5) a sea animal with a wide shell and five pairs of legs (crab)

6) (of) any member of the group of animals having a hard shell (crustacean)

7) a curved line in the shape of a spiral, as on a snail's shell (helix)

8) a fruit consisting of a hard shell round a part (kernel) that can be eaten; a small piece of metal with threaded hole for screwing on to a bolt; the head of a person (nut)

9) to cook (an egg) by cracking the shell and dropping the contents into boiling water; (to go on private land and) take (animals, fish etc) illegally (poach)

10) the pieces of an exploded shell or bullet (shrapnel)