The source of inorganic fertilizer is from plant or animal based materials that are either a byproduct or end product of naturally occurring processes like leaves, and compost.
C) the changes reflect...
Answer:
D. "always" cover the microscope when not in use.
Explanation:
when you are finished using a light microscope or any microscope in general you always need to put the cover back on it. Mostly, to protect it from any harmful bacteria, light etc. and to keep it clean and, from collecting dust.