Please help, this is to see which is the most related:

compost can be added to topsoil as a:

pesticide

all matter is made up of atoms

in any element all atoms are the same

elements in a compound are always in a constant ratio: apex

the sun's light combined with the visible wavelenghts form what is called ultraviolet radiation, which are the long waves at the end of a visible light sprectrum.

hope it ,

bioteacher101