A simile can be found when using "like" or "as" between two things. Example: I'm as happy as a clown.
Your question would be a metaphor. Both things are being compared to a science expieriment, probably meaning that they need to have an outcome, but it isn't known for sure if it will be a good or bad outcome.
Things like this can be taken many ways, so if you think something else, I'm sure it would work as well.
B. Putting ideas and concepts together to form a conclusion.
Answer:
The prepositional phrase is: "in the pool" .
As such, you would put a "P" over each of the 3 (three) words in the phrase:
" in the pool" .
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