Which process will directly result in organic matter being added to the soil? water freezing in cracks of rocks

glaciers carving out a valley

river water eroding the banks of a stream

bacteria breaking down dead matter

PLEASE ANSWER ASAP I WILL MARK U BRAINLIST!

bacteria breaking down dead matter.

Explanation:

the nitrogen cycle provides nitrogen to the ecosystem from the atmosphere, ground and oceans. nitrogen is an important component of complex molecules such as amino acids and nucleotides, which lead to the creation of proteins and dna, the building blocks of all life. plants absorb nitrogen in the form of ammonium, nitrate ion and, on rare occasions, as amino acids. animals receive nitrogen necessary for biological processes from feeding on living or dead organic matter.