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.
Since the Action AA batteries last 4 times as long as Bonus AA ones, even though they cost four times as much for convenience in only having to change them once compared to 4 times for the same length of time, this is a good reason to buy them. This is especially the case if the batteries are being used in a remote place such as by a geologist with a GPS out in the bush then he/she doesn't have to worry about them running down so much.
Genetic material, wouldn't that make it DNA? I took Biology last year so it's a little hard for me to remember but I think it is DNA.
