Students made a hygrometer by sealing the end of a straw with wax and adding some sand until the hygrometer floated in fresh
water. Students then collected water samples from around Virginia
to see how well the hygrometer floated in the different water
samples collected. Which of these explanations best fits the
observation

what are the options

since there are no options posted i'll give you a few examples.

a dolphin's flipper, bird's wing, cat's leg.

if the hares very faster than they are now, and thus the lynx's hunting success rate drops because it will be harder to catch them, the rate that will change will be the pray-rate. the pray-rate will change because more hares will be able to survive, thus more individuals for reproduction, so the end result will be increasing population of hares.

the predator-rate will remain pretty much the same because there will be more than enough pray, but the hunting success rate is stagnant.