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Write four distinguishing characters of phylum-Echinodermata.

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i.Body of animals belonging to phylum echinodermata is composed of calcareous spines, hence they are called as echinoderms.
ii.They are exclusively found in the ocean.
iii.Animals that belong to phylum Echinodermata are triploblastic, eucoelomate and radially symmetrical. Larval forms however bilaterally symmetrical.
iv.Tube feet is used for locomotion and capturing the prey. However, some animals are sedentary .
v.Their skeleton is made up of calcareous spines and/or plates called ossicles.
vi.These animals have a good ability of regeneration.
vii. They are mostly unisexual. e.g. Star-fish, sea urchin, brittle star, sea-cucumber, etc.
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