Question

1. what kind of symmetry do most echinoderm adults display?

pentaradial symmetry
bilateral symmetry
radial symmetry
asymmetry

Explanation:

Echinoderms (like starfish, sea urchins) as adults typically show pentaradial symmetry, meaning their body parts are arranged around a central axis in five-fold symmetry. Bilateral symmetry is more common in organisms with distinct left - right sides (like humans), radial symmetry is a more general form of symmetry around an axis (but echinoderms have the specific pentaradial), and asymmetry means no symmetry, which is not the case for echinoderm adults.

Answer:

A. pentaradial symmetry