What is the advantage of the occurrence of larval stage, Biology

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Q. What is the evolutionary advantage of the occurrence of larval stage and sperm cells in the life cycle of sponges?

The sexual reproduction in sponges in addition to contributing to genetic variability also facilitates the colonization of farther environments by these beings since larvae and sperm cells are mobile and can swim in the external to compensate the immobility of the adult individual.

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