Frogs have a _-chambered heart.
alveoli organ ovaries oxygen edible three nektar CO 2
A B C D E F G H
All frogs are amphibians.
Frogs have a three-chambered heart.
Frogs have a _-chambered heart. (A) alveoli (B) organ (C) ovaries (D) oxygen (E) edible (F) three (G) nektar (H) CO 2