If hares with long legs run faster than hares with short legs, which hares do you expect would be most likely to survive and reproduce

In this case, the hares with longer legs would be more likely to survive. This is due to the fact that hares are pretty defenseless creatures. Mostly, the one thing going for them to get away from predators is running, so the ones that run faster would then, logically, be more likely to survive long enough to reproduce, whereas the slow bunnies would get eaten before procreating. 

The answer to this will be from your lab notes/procedure. it would be best to ask another student who participated in the lab as we do not know what was done, what enzyme or if the temperature is celsius or fahrenheit. if i were to guess though i'd say the rate stopped due to enzyme denturing at high temperature

C. a mature ovule of a plant.