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What are the five major extant classes of the phylum Echinodermata?
Biology
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A
The phylum Echinodermata is divided into five major extant classes. These classes are:
- Asteroidea (sea stars)
- Ophiuroidea (brittle stars and basket stars)
- Echinoidea (sea urchins and sand dollars)
- Holothuroidea (sea cucumbers)
- Crinoidea (sea lilies and feather stars)
Therefore, the correct option is A.
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