Circulatory System Video Lessons

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Problem: The only vertebrates in which blood flows directly from respiratory organs to body tissues without first returning to the heart are the ________.a. amphibiansb. fishesc. mammalsd. reptiles

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Problem Details

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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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Circulatory System concept. You can view video lessons to learn Circulatory System. Or if you need more Circulatory System practice, you can also practice Circulatory System practice problems.

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Our tutors rated the difficulty ofThe only vertebrates in which blood flows directly from resp...as low difficulty.

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Our expert Biology tutor, Kaitlyn took 5 minutes and 47 seconds to solve this problem. You can follow their steps in the video explanation above.