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    Exam 20: Evolution and Medicine
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    Explain Why It Was Beneficial for Primitive Fish to Have
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Explain Why It Was Beneficial for Primitive Fish to Have

Question 47

Question 47

Essay

Explain why it was beneficial for primitive fish to have a pouch of esophagus or gut tissue that trapped gas bubbles, but why it was problematic for humans.

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In low-oxygen environments, these pouche...

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