The answer is C) Living organisms use matter and energy for their life processes.
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The correct answer is letter A. The disk soaked in distilled water is the controlled variable because it is the only differential factor from all of the other variables which are all disinfectants. Controlled variables are elements that are not changed throughout the experiment. When something is unchanged it is better for scientists to analyze the relationships of other variables better.
The answer is A because they need the sunlight to go through the water
Answer:
I'd like to help but the question is not clear....
could u edit the question and send it again.
Answer:
<u><em>Renewable energy</em></u> is energy generated from natural resources such as sunlight rain and wind.
