Which is an example of a sudden change that could lead to the extinction of species? A. a mountain range isolates a species
B. Earth's tectonic plates move
C. a volcano erupts
D. sea level change

D

Explanation:

Right now a similar thing is happening by global warming which is leading to polar bears becoming extinct

Edit:Also B and C happen on a regular basis but rarely lead to the extinction of a species and A would lead to the evaluation of an isolated species

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.

your spelling is a little off : ]