B.) Inversion.
I'm not quite sure, so might wanna double check, but I think that's correct. Hope I helped, if not I apologize.
Global warming in ozone layer, co 3 level less in the atoms sphere.
There are different materials of raw water, but also the raw water comes from ponds,rivers, and oceans but they might be good sometimes, and gas not been treated and has bacteria or mold buy that is not good.
Gene Therapy is an attempt to correct a genetic disorder by replacing a mutated gene with a normal allele. These disorders are usually hereditary, passed down through generations.