Cobie is testing how the amount of fertilizer affects the height of plants. Which variable does NOT need to be controlled. * Athe amount of fertilizer
Bthe type of plants used
Cthe amount of water each plant gets
Dthe location of the plants

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explanation:

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.