Which feature of echinoderms allows them to feed on the soft body parts of bivalves?

Name: Which feature of echinoderms allows them to feed on the soft body parts of bivalves?
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Echinoderms are able to feed on the soft body parts of bivalves due to their eversion ability of stomach. They can push their stomach out through their mouth and into the bivalve's shell. The stomach then secretes digestive enzymes to break down the soft tissues of the prey, which is then absorbed into the stomach.

Which Feature of Echinoderms Allows Them to Feed on the Soft