Which of the following is a critical factor driving evolution? Environmental conditions
Health in comparison to similar organisms
Ability to acquire food
Strength in comparison to similar organisms
All of these are equally important

all of these are equally important, what if there is an option for natural selection, natural selection would be the most important but for this it's all these are equally important.

the index of refraction of the second medium is higher. i just took the test trust me !

sorry to break it to ya but no one can answer your question it's just

jk but i am serious about the part that most people cant answer it beacuse you did not mention the section you are talking about. but it would if you added some detail and were a bit more specific.