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25.1 FlatwormsBody Structure of FlatwormsFlatworms are on the _________________ branch of the evolutionary tree.________________ symmetryThin, _________ bodiesDefinite __________ region and body ______________Lack a ____________Feeding and DigestionFree-living flatworms feed on __________ or ___________________ organisms.______________ flatworms have modified feeding structures called __________ and ______________, which enable them to stay _____________ to their hosts.9698602476500Respiration, Circulation, and Excretion_______________ moves dissolved ___________ and ______________ to all parts of their bodies._______________ _____________ and other ____________ also are removed from flatworm cells by diffusion.____________ cells move water out of the body to excrete waste products and maintain ____________ _____________.416877513335000Response to StimuliThe __________ system regulates the body’s response to stimuli.MovementMove by ____________ muscles in the body __________Glide by using __________ located on their undersidesReproductionFlatworms are ________________.Two different flatworms exchange _________, and the _______ are fertilized internally.______________ flatworms can reproduce asexually by __________________.371217429500TurbellariansLive in ___________ or freshwaterHave _____________ that can detect the presence or absence of __________Sensory cells help them identify chemicals and water movement.TrematodesParasites that infect the _________ or body ___________ of their hostsThe parasitic fluke Schistosoma requires ________ hosts to complete its life cycle.These fluke eggs clog blood vessels, causing swelling and eventual tissue damage.-4420922098000CestodesParasites adapted to life in the _____________ of their hosts322368219812000________________ form continuously; as new ones form near the __________, older proglottids move farther back and mature. ................
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