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A Review Of fitness

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Circulatory units are absent in some animals, such as flatworms. Their overall body cavity has no lining or enclosed fluid. As an alternative a muscular pharynx contributes to an thoroughly branched digestive system that facilitates direct diffusion of nutrients to all cells. The flatworm's dorso-ventrally flattened human body condition also http://daddysharkdooshirt66441.collectblogs.com/12610423/5-simple-statements-about-cardiovascular-explained

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