The control group outs the one that you don't change. The reason you don't change it is because you use it as a comparison with the other groups.
<span>The most appropriate choice of needle for someone of this size is a 1.5 in, 22 gauge
needle. It is important for the needle to be 22 gauge so that it is an appropriate thickness to be injected into the muscle tissue.</span>
The category is just called plants
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The answer is photosynthesis.
