The sentence is in past tense. This is noted by the ending -ed in the word healed.
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.
An abstract noun is a noun that you can't feel, hear, taste, smell, and see. Like hope. A concrete noun is a noun that you CAN feel, hear, taste, smell, and see.
So the abstract noun in this sentence is not choir, but harmony.
hope it helps!
Answer:
HE/SHE INCREASED HIS/HER FUNDING PROGRAM
Answer:
These interesting plants can be found in many state parks open to the public.
Explanation:
This option is the only fact and adds onto where they are located. The others are opinions.
