Circulatory and Respiratory Anatomy Video Lessons

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Problem: If the ancestral form for a particular lineage was aquatic and used gills for respiration, what changes would you expect to see in a terrestrial descendant?

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Gills: O2 diffuses from water to capillaries

Lungs: O2 diffuses from air to capillaries

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If the ancestral form for a particular lineage was aquatic and used gills for respiration, what changes would you expect to see in a terrestrial descendant?

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