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Generally a control is one that you are not using any of the tested material on. You want to establish normal growth, so that you can get accurate results from your variables.
I don't understand
You would want to use a plant with no decomposing matter as a control, because you need to know normal growth without any extra fertilizer before you can determine the additional growth due to decomposing matter (like apple peel or potato peel).
it not both. its A
D should be your control
What grade you in/
High School teacher taking undergrad course in physics
you are teacher
so part student and part teacher
Hopefully you make a good teacher
I try, not sure if I'm a good teacher, but I care about the kids and try to help them
that would make good a teacher.Ms. Carman
D. a plant with no decomposing matter is the control