In an experimental procedure,the researcher has established multiple levels of a chemical,or amounts of light,or some other factor at the beginning of the experiment,in order to determine if and how much the biological system responds.The manipulated factor at varying levels is the

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The manipulated factor at varying levels is the independent variable, as it is intentionally changed by the researcher to observe its impact on the dependent variable. The control group is typically used as a baseline comparison and does not involve the manipulation of the independent variable. The dependent variable is the outcome being measured and is expected to respond to changes in the independent variable. The standardized variable refers to other factors that are kept constant throughout the experiment to ensure that any observed effects are due to the independent variable and not some other variable.

In an Experimental Procedure,the Researcher Has Established Multiple Levels of a Chemical,or