Having a control in an experiment allows you to see what happens when no variables are changed. If you do not have a control, you do not have anything to compare your results with after changing variables of the experiment.
Adjustment knobs are used to focus light in a light microscope.
stimulus
survival
The chemical or chemicals formed in a chemical reaction are called the product of the chemical reaction.
Because it is as old as stone itself.
Lyndon B. Johnson
It is not safe to drink or eat chemicals.
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Biology
Many Middle Eastern Muslims have come to resent the United States
A reactant is a substance that participates in and changes during a reaction.