Multiple choice

During hibernation, frogs respire by

  1. external gills

  2. lungs and buccopharyngeal cavity

  3. internal gills

  4. moist skin

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Frogs use their skin to soak in the oxygen their bodies require. When they hibernate, they utilize the skin for any and all breathing. Damp skin is a must for subcutaneous gas exchange. If a frog's skin becomes dry, it will no longer be able to take in oxygen.

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