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Animals which Breathe through their Skin

Reference chapter

Question 1
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The frog is an animal which breathes through its skin as well as by using a pair of simple lungs. It is possible to measure how much the frog breathes through its skin and through its lungs separately. The graph below shows how much the frog uses these two different ways of breathing throughout the year.

Graph

Questions

1. When does the frog use its lungs the most during the year?

2. When does the frog use its lungs least during the year?

3. Does the frog breathe in oxygen mostly through its skin or mostly through its lungs?

4. Why do you think that the frog needs more oxygen in spring and why does it need so little oxygen in winter?

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