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

Biology · College · Tue Nov 03 2020

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The amount of fertilizer should be controlled because Cobie is testing the AMOUNT of fertilizer that affects the height of plant. Water should be controlled because water is a medium that can carry nutrients from the soil to the plant. Location of the plant is a variable that needs to be controlled because there plants responds to the stimulus of the environment therefore it can be a variable that leads to different result. Therefore, the answer is B. Type of plants used.

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