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Biology
Roger Esparza
1 August, 07:01
What are four structures used for gas exchange
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Aurora Schwartz
1 August, 10:25
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Single-celled organisms exchange gases directly across their cell membrane. However, the slow diffusion rate of oxygen relative to carbon dioxide limits the size of single-celled organisms. Simple animals that lack specialized exchange surfaces have flattened, tubular, or thin shaped body plans, which are the most efficient for gas exchange. However, these simple animals are rather small in size.
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