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Biology 17 Online
OpenStudy (anonymous):

Which of the following is true of vertebrates with four-chambered hearts? https://scontent.fphx1-1.fna.fbcdn.net/hphotos-xft1/v/t34.0-12/11749832_674825639283895_354148979_n.jpg?oh=53cb138b208eaf18984e131fd81eafe9&oe=55B2685D

sam (.sam.):

I'll give you a hint, normal 4 chambered heart do not mix blood. And remember gas exchange is performed inside the lungs.

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