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The only vertebrates in which blood flows directly from respiratory organs to body tissues without first returning to the heart are the _____. A) amphibians B) fishes C) mammals D) reptiles
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The only vertebrates in which blood flows directly from respiratory organs to body tissues without first returning to the heart are the _____.

A) amphibians
B) fishes
C) mammals
D) reptiles

User Jiyoon Hur
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2 votes

Answer:

The correct answer is B) fishes

User Coykto
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