The substage condenser is either incorrectly positioned or the light stop is the wrong size for the objective- or there me be a smudge/mark on the eyepiece
Compare it to respiration in the human body or like how a car converts fuel to work or how a machine works because of electricity
Sounds like infectious would fit.
The answer is none of the above because organic materials, gasses, and minerals are all component soils.
Hope this helps!!!!!!!
Please give brainliest!!!!