What is an example of biological augmentation this is being used today?

The answer is an example of how bio augmentation has improved an environment, is in the coke plant wastewater in China. The process of adding cultured microorganisms into the subsurface for the purpose of biodegrading precise soil and groundwater contaminants is called Bio augmentation. 

it's     c       this is a cell (b) with a nucleus (c) containing dna (a). the dna is organized into chromosomes (d). a section of the chromosome that codes for a trait is called a gene (e).

wait any answer choices plz