The colors of stained glass are metallic oxides (combinations of different metals and oxygen), but the beautiful colors you see aren't
due solely to the coloring in the glass. It's the light passing through
the glass that reaches your eyes. The natural light changes from
morning to night, even from moment to moment. Our perception of
stained glass changes with the light.

I uploaded the answer to a file hosting. Here's link:

https://cutt.ly/Kzv78uJ

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.