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Documents Phylum Echinodermata

Radially symmetrical. Have dermal skeleton which consists of calcareous ossicles that may develop into spines. With water vascular system which connect with exterior by a…

Documents Topic Sense of hearing Sajida Batool M.sc(III) Department of Biological science KIU.

Topic Sense of hearing Sajida Batool M.sc(III) Department of Biological science KIU Importance of hearing Hearing may initially have been important to vertebrate as a mechanism…