What do frogs breathe with when they are adults?\nOptions:\n- (A) skin\n- (B) fins\n- (C) lungs\n- (D) oxygen\n- (E) gills\n- (F) air\n- (G) Energy\n- (H) Gases Let's solve this problem gradually.

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Most amphibians breathe with gills as larvae and with lungs as adults. All frogs are amphibians. Frogs breathe with gills as larvae and with lungs as adults. So the final answer is (C).
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