Starfish and sea urchins are
1) mollusks.
2) echinoderms.
3) arachnids.
4) annelids.
Answer (2)
Starfish and sea urchins are classified as echinoderms , known for their radial symmetry and ability to regenerate. They differ from mollusks, arachnids, and annelids in significant biological ways. Thus, the correct answer is option 2, echinoderms . ;
Starfish and sea urchins are classified as echinoderms, which are characterized by radial symmetry and a hard endoskeleton. They differ significantly from mollusks, arachnids, and annelids. Therefore, the correct answer is option 2, echinoderms.
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