Echinoderms and cnidarians
A) are both radially symmetrical.
B) both have three germ layers.
C) both have the sac body plan.
D) are both deuterostomes.
E) are both found in freshwater.

Question

Quizplus · Accepted Answer

Both echinoderms and cnidarians exhibit radial symmetry, meaning that their body parts are arranged around a central axis. However, echinoderms have a pentaradial symmetry (divisible by fives), while cnidarians have a biradial symmetry (divisible by twos). Choices B, C, D, and E are all incorrect because echinoderms and cnidarians differ in germ layer number, body plan, embryonic development, and habitat.

Echinoderms and Cnidarians