Deductive reasoning.
Deductive reasoning is a type of reasoning where a general fact is broken down into a more specific case to make an inference. This general fact can be a broad branch of knowledge then gets into its parts that may comprise this broad knowledge.
Over population if i recall correctly
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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.
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The Mars Ascent Vehicle in "The Martian" is powered by a radioisotope thermoelectric generator (RTG), which converts the heat of the radioactive decay of plutonium-238 into electricity. This RTG is buried a safe distance away from the pioneers' living quarters.
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