The main point of paragraph 4 is that wild shrimp are close to the bottom of the food chain
Mr. Adamson needs to keep predators out of his tanks
Mr. Adamson is an aquaculture technician
most aquaculture shrimp are eaten by people

c is the answer because when something is left after something evaporates that shows the chemical change.

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be

idk what the question is about