Reservoir is the answer to your question.
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She could use a control to compare her data to and make sure it is cleaner. Ex. Use the old detergent on ten shirts and then use the new detergent on another ten shirts. She would then compare the shirts she did each detergent on and come up with her conclusion.
plants give off oxygen and take in carbon dioxide and animals take in oxygen and give off carbon dioxide.
Chloroplasts are green pigment used in the process of photosynthesis found in leaves.
Leucoplasts are colourless and are the storehouse of minerals and other nutrients found in the roots of plants.
