8. when testing the benefits of a new fertilizer on the
growth of tomato plants, the control group should include
which of the following? *
o
a) tomato plants grown in soil with no fertilizer
o
b) tomato plants grown in soil with the original type of fertilizer
o
c) tomato plants grown in a different type of soil with the new fertilizer
o
d) tomato plants of different varieties grown in soil with new fertilizer