Question

A scientist conducts an experiment to test the effects of light on earthworm activity. Which is a variable in this experiment?

Answer 1

They're two types of variables, one being the responding the other being the controlled.
1-The controlled would be the light since the scientist would manipulate how much light the earthworm is given.
2- The responding would be the earthworm activity since it is reacting to the amount of light on it.

Answer 2

There will be two Variables in this experiment:
a) earthworm Activity
b) Variation in the light intensity