Which phylum consists of animals that are fre | vedclass

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(C) The phylum $Echinodermata$ exhibits a unique life cycle where the larvae are bilaterally symmetrical and free-swimming,while the adults are radial

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Echinodermata

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(C) The phylum $Echinodermata$ exhibits a unique life cycle where the larvae are bilaterally symmetrical and free-swimming,while the adults are radially symmetrical and typically sessile or sedentary,living attached to a substrate or moving slowly along the ocean floor. While some $Cnidarians$ (like polyps) are sessile,the larval stage $(planula)$ is free-swimming; however,$Echinoderms$ are the classic example often cited in biology for this distinct transition in symmetry and lifestyle.

Which phylum consists of animals that are free-swimming in the larval stage and sessile (attached to a substrate) in the adult stage?

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