A group of three closely related species of frogs are found in a geographic rang

Question

A group of three closely related species of frogs are found in a geographic range that extends from sea level to high elevations. One species is found at sea-level, one at mid altitude and one at high altitude. These species of frogs obtain most of their oxygen by diffusion across the surface of their skin. One of the differences between the species is the degree of folding found in their skin. One species exhibits extensive folding, one minimal folding, and one moderate folding. Complete the chart below by predicting which folding you would expect to find at each elevation and give a rationale for the expected distribution.

Explanation / Answer

Elevation Folding

Sea level Extensive

3000 ft Moderate

6000 ft Minimal

As we know the availability of oxygen decreases with high altitutde. The frog species which are at high altitude will need to grab more oxygen which is only possible with thin skin (minimal folded skin) as more diffusion of oxygen will take place with thin skin (minimal folded skin). On the other hand the frog species which is at sea level, will have more availability of oxygen and hence it can grab sufficient oxygen even with thick skin (extensive folded skin) as diffusion rate of oxygen is high due to higher availability of oxygen in environment.

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