If you were trying to identify an unknown adult animal that must be either an echinoderm or chordate, which morphological features) would guarantee that your organism was an echinoderm rather than a chordate?

Question

Quizplus · Accepted Answer

A radially symmetrical body plan is a defining characteristic of echinoderms and is not found in chordates, which have bilateral symmetry. The other options (fluid-filled vascular system and calcium-based endoskeleton) may be present in both echinoderms and chordates. Therefore, the only definitive feature to distinguish between the two groups is body symmetry.

If You Were Trying to Identify an Unknown Adult Animal