Question

Echinoderms, like sea stars, have a nervous system.

A) Ring- like
B) ladder- like
C) Nerve net

Answer 1

What do you think the answer is?

Answer 2

Unlike the hydras and jellyfish, invertebrates such as sea stars (echinoderms) display some centralized organization of the nervous system. A ring of neurons is located in the center of the sea star, and simple bundles of neurons called radial nerves extend from the ring to the tip of each arm. In each arm, extensions of the radial nerves form nerve nets as in the jellyfish. This arrangement permits coordinated movement of each arm and the tube feet located on the surface of the arm.

Read more: http://www.biologyreference.com/Mo-Nu/Nervous-Systems.html#ixzz3a1fncQ9j

Answer 3

The answer is A) Ring-like by the way.

Answer 4

Thanks guys =)