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OpenStudy (anonymous):
As various vertebrate groups evolved, the structure of the heart changed. Which of the following describes the hearts of birds and mammals?
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OpenStudy (anonymous):
@Burningitdown Birds and mammals have 4 chambered heart. Amphibians and reptiles generally only have three, but crocodilians have 4.
OpenStudy (anonymous):
Alright, which answer would that relate to then?
OpenStudy (anonymous):
D?
OpenStudy (anonymous):
??
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