Answer: The independent variable is the one that is changed/controlled by the scientist. To ensure a fair test, a good experiment has only one independent variable. ... Experiments also have constants or controlled variables. Controlled variables are things that a scientist wants to remain the same throughout the experiment.
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They are the result of slight changes in the genetic information that produces them.
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This increases the chances of a successful collision and so the rate increases. There is a certain temperature at which an enzyme's catalytic activity is at its greatest (see graph). This optimal temperature is usually around human body temperature (37.5 oC) for the enzymes in human cells.
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