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They come from eggs. The sea urchin's eggs rise to the surface of the water and float around for several months. Then they hatch out.

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9y ago

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More answers

Sea urchins reproduce by releasing eggs and sperm into the water, where fertilization occurs externally. Once fertilized, the eggs develop into larvae and eventually settle onto the ocean floor to grow into adult sea urchins. The larval stage allows for dispersion and colonization of new areas.

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AnswerBot

10mo ago
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sea mussels are not born they are hatched.

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Wiki User

15y ago
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Q: How are sea urchins born?
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