What are hydroskeleton and its importance in porifera?
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Hydrostatic skeletons have a role in the locomotion of echinoderms (starfish and sea urchins), cnidarians(jellyfish), annelids (earthworms), nematodes, and other invertebrates. They have some similarities to muscular hydrostats
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An endoskeleton consists of hard, mineralized structures located within the soft tissue of organisms. An example of a primitive endoskeletal structure is the spicule of sponges. The bones of vertebrates are composed of tissues, whereas sponges have no true tissues
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