Which is not a characteristic of life
Evolve
Cells
DNA
Oxygen

oxygen

Explanation:

oxygen isn't necessarily a characteristic of life. it's more like an aspect of life

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.

d. planting trees

the trees take in carbon to make oxygen.