Throughout, make sure you have a copy of the

Student Guide and your data table.

In this experiment, you changed the

and measured the effect of this change on the

in the population.

DONE

In this experiment, you changed the number of worms in the soil and measured the effect of this change on the plant growth in the population.

The independent variable was the number of worms, and the dependent variable was the plant growth.

Explanation:

right on edge!