Answer:
the central idea of the poem is that there are many challenges and obsticals on the way to success
<span>A. one of the boards from the floor
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Answer:


What is the central idea of this excerpt?
The Grimms collected stories about real living conditions from people they trusted.
In this excerpt, we learn that the Grimm brothers collected the tales they published from people who were mostly literate. These literate people, however, obtained their information from illiterate people who believed in the authenticity of the stories.
Summarily, we can arrive at the conclusion that the Grimm brothers obtained their stories from people they trusted. These people believed in the trueness of the tales.

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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.