Two traits encoded by 2 different genes are linked, but they are usually not inherited together. The most likely reason is A. they are not on the same chromosome
B. they are not sex linked
C. they are on the same chromosome but are far apart D. they are close together on the same chromosome

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.

c. heat from the poles back down towards the equator.