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Answer:
Mitochondria
Explanation:
The enzymatic reactions of cellular respiration begin in the cytoplasm, but most of the reactions occur in the mitochondria.
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Hypothesis: Daphnias can increase in population at a room
temperature, rather than a colder or warmer temperature. 
Control group will be at a room temperature water. The experimental will be tested in cold and warmer waters.
Independent variable: change of water temperature. 
The data will be the amount of growth in which the water fleas population increases or decreases, a bar graph would work.