james took two pea plants, placing one in a dark closet and the other on a sunny window sill. both are located in air-conditioned rooms. he then measured the growth of the pea plants after a week. in this experiment, the dark closet is a(n)

independent variable

Explanation:

Independent variable is controlled by the experimenter; however, the dependent variable depends on the independent variable. Here the dark closet is the independent variable and the growth of the plant is the dependent variable. A dependent variable is measured by the experimenter. An independent variable does not get affected by the experiment.

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

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