Question

Which is not an echinoderm?
A)sea star
B)sea urchin
C)sand dollar
D)spider​

Answer 1

D)spider​

Step-by-step explanation:

Starfish, Sea urchin, and Sand dollar, all of following are echinoderms. A spider is a an arachnid.

Answer 2

An echinoderm is a marine invertebrate. Starfish, Sea urchin, and Sand dollars are all echinoderms. A spider is an arachnid. Which means a spider is *NOT* an echinoderm.

Answer: D) Spider

Hope this helps. :-)