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The vertebrates in which blood flows directly from respiratory organs to body tissues without first returning to the heart are the ________.

a. fishes
b. birds
c. mammals
d. reptiles
e. amphibians

User Qubyte
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2 Answers

5 votes
The best answer among the following choices would be the first option aka A) Fishes because they have backbone and this is a description of their body.
User Jan X Marek
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6 votes
Fishes :) hope this helps

User William Xing
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