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.
Answer:
14. John Ruskin said, "I believe the first of a truly great man is his humility".
15. "Put all the trash in the box", my father directed.
16. John's parents are from Las Vegas, Nevada.
Adjective ? Since it’s describing a noun!
