A scientist plants two rows of corn for experimentation. She puts fertilizer on row 1 but does not put fertilizer on row 2. Both rows receive the same amount of sun and water. She checks the growth of the corn over the course of five months. What is acting as the control group in this experiment? Select one:
a.
The corn without the fertilizer.
b.
The corn with the fertilizer.
c.
The amount of water.
d.
The height of the corn plants.