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the valve between the left atrium and the left ventricle.
the development of a distinct head, with a concentration of nervous tissue and sense receptors...
simple epithelium with cuboidal shaped cells that lines various glands with a secretory function...
a response of the body tissues to injury or irritation. It causes pain, swelling, redness and...
single-celled algae that have two flagella and are found mainly in seawater but are also common...