Answer:
The controlled variable of an experiment is the one thing that stays the same in an experiment.
Explanation:
An example would be : if I have two pennies, both dunked in water, but than I change one to be dunked in vinegar, the one dunked in water still is the constant or the controlled variable.
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Answer:
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Photosynthesis is the process in which a plant absorbs minerals, water, carbon dioxide and of course sunlight. It then converts all of this into starch, which is its energy, and its main by-product oxygen, which it releases into the air.