What is bioremediation? How it helps in controlling soil pollution? (AS1)

"It is natural process uses to treat contaminated things (water and soil)"

Or

"It is process in which we use organisms to remove contamination."

Or

"Bioremediation means to use a biological remedy to abate or clean up contamination."

Bioremediation is the biological process of breakdown, degrade and removal of contaminated substances from the soil. It also increases the Soil fertility by providing nutrients to the soil. Thus, decrease the soil pollution.