What is the passage mainly about?A.Reproduction in echinoderms.B.How fish avoid their enem

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What is the passage mainly about?

A.Reproduction in echinoderms.

B.How fish avoid their enemies.

C.The form. of starfish.

D.The feeding habits and digestive systems of starfish.

请帮忙给出正确答案和分析,谢谢!

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