91Ó°ÊÓ

Identify the functions for which echinoderms use their tube feet.

Summarize how pharyngeal pouches have become modified through evolution in aquatic chordates and in terrestrial chordates.

Use the following terms to create a concept map that sequences the path of water through the water-vascular system of a sea star: water, radial canal, madreporite, ring canal, tube foot, and stone canal.