Question

12. What is the essential difference between the
larvae and adults of echinoderms symmetry
wise?​

Answer 1

Answer:

While echinoderm adults are radially symmetrical, the larvae are bilaterally symmetrical. They don't have a head, but they do have a front end, and they have sides that are mirror images of one another. Both internal organs and external surfaces reflect this symmetry, at least in the early forms.

Explanation:

Although adult echinoderms possess pentaradial, or five-sided, symmetry, echinoderm larvae are ciliated, free-swimming organisms that organize in bilateral symmetry which makes them look like embryonic chordates.