Which statement describes the independent variable?
a. it is measured and recorded as data.
b. it is unchanged in the experiment.
c. it is also called the responding variable.
d. it is also called the manipulated variable.

Answer;

D.It is also called the manipulated variable.

Explanation;

A manipulated variable is the independent variable in an experiment. It's called “manipulated” because it's the one you can change.

An independent variable is the variable that is changed or controlled in a scientific experiment to test the effects on the dependent variable.A dependent variable is the variable being tested and measured in a scientific experiment.

The dependent variable is 'dependent' on the independent variable. As the experimenter changes the independent variable, the effect on the dependent variable is observed and recorded.

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.

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