Choose the correct statements describing the experiment shown on the right.
group a is the experimental group because it receives the treatment.
group a is the control group because it does not receive the treatment.
group b is the control group because it does not receive the treatment.
group b is the experimental group because it receives the treatment.

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.

answer; coat color for blending in with dry grass;