no, a lobster is a crustacean, not an echinoderm
It depends on the type of crab. For example, fiddler crabs are of the genus Uca (Ocypodidae). And the blue crab is in the genus Chionoecetes.
green crab or dogga crab
no
if you go near the green crab don't bother them or they will snip you and won't let go and it will hurt you and only a person how has worked with crab can get it of and the crab can breack your finger bone if it wants to.
humans
CLAMS
yes it does
It is a green hermit crab with blue claws.
A starfish is an echinoderm.
Echinoderm is an invertebrate and therfore it has no backbone
Yes sand dollar is an echinoderm.