They help because if you can adapt to things a camouflage evolution will be eaiser.
Answer:
I think she should try the experiment one set with fertilizer, and one without. The negative control group would be the set of rose bushes grown without the fertilizer, but under the exact same conditions as the experimental group. Then, if a difference is seen you can be sure it's accurate, since you tested with and without fertilizer under the same conditions. Sorry if i am wrong, I am not completly sure about this one. Again I might be wrong so sorry in advance.
In general, the term organelle is used for the small structures within a cell.
I dont understand what you are asking please retry asking the question thanks
