Question

1. a variable that remains unchanged throughout an experiment is called the

a. control variable.

b. experimental variable.

c. independent variable.

d. dependent variable.

Explanation:

In an experiment, a control variable is held constant to ensure that it doesn't affect the outcome. An experimental variable is manipulated, the independent variable is the one the researcher changes, and the dependent variable is the one that is measured and affected by the independent variable. The variable that remains unchanged throughout an experiment is the control variable.

Answer:

A. control variable