If a certain band on one chromatography strip has been identified as chlorophyll a, chlorophyll a could be identified on a second chromatography strip by looking for a
band
a. in a parallel position
b. of darker color
c. in reverse position
d. with no color

i think that it is plants

that is true   : ) hope this you

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.