Which phylum do starfish and sea urchin belong to?

Echinodermata

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Mollusca

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Arthropoda

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Coelenterata

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Solution

The correct option is A Echinodermata
Starfish and sea urchin, both belong to phylum Echinodermata.
The characteristics of organisms belonging to phylum Echinodermata are:
i) Pentaradial symmetrical body, skin is covered with spines.
ii) Tube feet and well-developed water vascular system.
iii) Body framework is formed of calcareous plates known as ossicles.

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