Which phylum includes starfish and sea urchins?

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Multiple Choice

Which phylum includes starfish and sea urchins?

Explanation:
Echinodermata is the phylum that includes starfish and sea urchins. Members of this group are marine invertebrates with a water vascular system used for locomotion and feeding, a calcareous internal skeleton, and typically fivefold symmetry as adults. These traits distinguish them from chordates, mollusks, and arthropods, which have different body plans. Starfish and sea urchins share these features, placing them firmly in Echinodermata.

Echinodermata is the phylum that includes starfish and sea urchins. Members of this group are marine invertebrates with a water vascular system used for locomotion and feeding, a calcareous internal skeleton, and typically fivefold symmetry as adults. These traits distinguish them from chordates, mollusks, and arthropods, which have different body plans. Starfish and sea urchins share these features, placing them firmly in Echinodermata.

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