Fe + H2SO4 → FeSO4 + H2 type of reaction

organisms are more likely to be more preserved in mud than sand because mud is moist and wet, while sand is very dry.

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

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.