I cannot understand why answer is D ... can someone pls help me.​

It is quite simple.

Lets start from the markings above the topic "external temperature."

3 lines after 20 C is 23 C. As you can see, both of them (animal 1 and animal 2 wave drawing on the graph) meet at that point. So thats why Option D is correct

explanation:

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.

the correct answer: the index of refraction of the second medium is lower i tried this persons answer and it was wrong this person is lying