Crinoids are marine ainimals that mak up the class Crinoidea, ane o the clesses o the phylum Echinodermata, that an aw includes the starfish, brittle starns, sea urchins an sea cucumbers.[3]
Crinoids are marine ainimals that mak up the class Crinoidea, ane o the clesses o the phylum Echinodermata, that an aw includes the starfish, brittle starns, sea urchins an sea cucumbers.