Sea urchins are spiny, globular animals that live on the ocean floor. How are sea urchins classified?
A. vertebrates

B. invertebrates

C. mammals

D. arthropods
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Answer
4 (3 stars)
2
Ruos4476 2 years ago
1 answer - 0 helps

Answer:

B

Explanation:

because they belong to classe Echinoidea, phylum echonodermata

(3 evaluations)
Answer
5 (1 star)
0
KiaraKitsune 2 years ago
5 response - 0 helps

Answer:

B

Explanation:

They have no bones, and therefore, they are classified as a invertebrate(s).

(1 estimation)

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