Some do but not all.
The radula (or some form of the radula) is found in all classes of mollusks except bivalves (organisms with two shells such as clams).
No not all Echinoderms have backbones like the starfish
Echinoderms live only in the sea.
Yes Eventually echinoderms do live in water.
No. Oysters do not have a radula
Yes, all echinoderms have radial symmetry.
no, a lobster is a crustacean, not an echinoderm
A mantel, a radula and a muscular foot.
One class of molluscs that lacks a radula is the Bivalvia, which includes clams, mussels, and scallops. Instead of a radula, these organisms have two shells that they use to filter feed. They do not require a radula for scraping or grazing on food sources like other molluscs.
echinoderms
Yes they do
both slugs and snails use a structure called a radula to eat.