It was affected by natural selection.
If this is wrong someone please tell me.
In medicine, genetic engineering has been used to mass-produce insulin, human growth hormones, follistim (for treating infertility), human albumin, monoclonal antibodies, antihemophilic factors, vaccines, and many other drugs. In research, organisms are genetically engineered to discover the functions of certain genes.
Answer: C
Explanation: C. Zone of aeration
I hope I'm right.
hope this helps
