________ is a phylum of spiny skinned sea animals.

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Solution

All the organisms in the Echinodermata phylum are exclusively marine and free living.
These animals have an exoskeleton of calcareous ossicles, hence Echinodermata (spiny bodied).
The adult organism of the phylum has radial symmetry, but the larva has bilateral symmetry.
Echinodermata is a phylum of spiny skinned sea animals.

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