Frogs have a _-chambered heart.\nOptions:\n- (A) alveoli\n- (B) organ\n- (C) ovaries\n- (D) oxygen\n- (E) edible\n- (F) three\n- (G) nektar\n- (H) CO 2
Hmmm, let me think. I don't want to be wrong, so I got to be careful.
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Amphibians have a relatively complex circulatory system with a three-chambered heart. All frogs are amphibians. Frogs have a three-chambered heart. The answer: (F).
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