Question

what effect does decreasing the temperature of a room have on a lifespan of a battery? the temperature of the room is the...

Explanation:

In an experiment, the independent variable is the one that is manipulated or changed to observe its effect on another variable. Here, the temperature of the room is being decreased (manipulated) to see its effect on the battery's lifespan. So the room temperature is the independent variable.

Answer:

A. independent variable