(1) De Jauregui, Ruth. "Do Flatworms Have Lungs?" Do Flatworms Have Lungs? - Animals. Club Momme, n.d. Web. 15 June 2016.
(2) Reece, Jane B., Lisa A. Urry, Michael L. Cain, Steven Alexander Wasserman, Peter V. Minorsky, Rob Jackson, and Neil A.
Campbell. Campbell Biology. 10th ed. New York: Pearson Education, 2014. 689. Print.
(2) Reece, Jane B., Lisa A. Urry, Michael L. Cain, Steven Alexander Wasserman, Peter V. Minorsky, Rob Jackson, and Neil A.
Campbell. Campbell Biology. 10th ed. New York: Pearson Education, 2014. 689. Print.
Low MaintenanceLungs, gills, a heart, blood, and vessels require a lot of energy to be maintained. It is more efficient to diffuse oxygen and carbon dioxide across the skin (1).
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Flat is GoodThe key word is efficiency. In order to take in as much oxygen as possible without expending so much energy in the process. As a result, the flatworm has a large surface area to take in a large amount of oxygen but it is flat so that oxygen can more easily reach cells (2).
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