The snail can protect itself by, when threatened, retracting into its shell and therefore hiding beneath their protective shell.
The advantage is that it can keep the animal from getting eaten. But it has to be replaced as the animal grows, which opens several long periods of vulnerability.
nada shatra
nothing
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advantages: superb protection, (like armour) camouflage disadvantages: must molt to grow, leaving unprotected temporarily
Echinoderms have internal skeletons.
Ossicles
Ossicles
No, they're mollusks, and have no skeleton at all.
because they have no skeleton.
protozoa, annelids, echinoderms, mollusks and arthropods. Arthropods include insects, crustaceans and arachnids
Calcium carbonate
Grasshoppers have an exo skeleton, meaning what gives them their shape is on the outside. Humans have endo skeletons. we get our shape from the bones inside.
the mollusc skelleton is know as bonerius bonerorious. It is within the boner kingdom of skeletal life. boner.