Concentration gradient is said to exist when thea. concentration of eons is lesser inside the cell and more outside the cell b. concentration of eons is lesser inside the cell and more outside the cell c. hypertonic solution enters the cell d. water enters by osmosis

the answer is trees if i'm not mistaken

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.