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Which echinoderms can live at depths greater than 10,000 metres?
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echinoderm
Starfishes.
Within the phylum Echinodermata, only sea cucumbers—members of the class Holothuroidea—are capable of inhabiting ocean depths of 10,000 metres (32,800 feet) and beyond. These organisms are highly successful in extreme deep-sea environments, where they can constitute more than 90 percent of the total weight of living organisms in the deepest ocean trenches.12