The five central themes of biology are structure and function of cells, interactions between organisms, homeostasis, reproduction and genetics, and evolution.
I’m almost positive the answer is C, I took environmental but the chemicals in aquifers that are unnatural start to seep into the ground and soil around it polluting more than the water. Sorry if I’m wrong been a while.
"Males who inherit the mutation get the disease because they have no second dystrophin gene to make up for the faulty one. Early in the embryonic development of a female, either the X chromosome from the mother (maternal X) or the one from the father (paternal X) is inactivated in each cell."
(courtesy https://www.mda.org)
Wish I knew wish I knew wish I knew wish I knew wish I knew wish I knew