A Feature of the Earliest Echinoderms Apparently Was Development of Endoskeletal

Q73: Arrow-worms feed<br>A)on plankton and small fish.<br>B)by retracting

Q74: The gill slits of enteropneust hemichordates function

Q75: The basic five arms of crinoids are

Q76: Pedicellariae are<br>A)larval sea stars.<br>B)the mouth-like openings into

Q77: How much nervous system does an echinoderm

Q79: During metamorphosis of sea stars,the left side

Q80: The most active of all echinoderms are

Q81: Small projections between the ossicles of sea

Q82: The common name for chaetognaths is<br>A)arrow worms.<br>B)acorn

Q83: Brittle stars differ from sea stars by<br>A)lacking