Jasmine is testing how the amount of fertilizer affects the heights of plants. Which variable does not need to be controlled?
the amount of fertilizer
the amount of water each plant gets
the location of the plants
the height of the plants
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stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms

photosynthesis makes the glucose that is used in cellular respiration to make atp. the glucose is then turned back into carbon dioxide, which is used in photosynthesis. while water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.

the answer is c. altitude. hope this ! #brainiac