Answer:
D. There is a reduced use of pesticides, herbicides, and fertilizers
Explanation:
There are lots:
Biology and Medicine - cloning and expression of human insulin in bacteria (stopped having to produce it from pig pancreases); Watson & Crick discovery of the structure of DNA; gene therapy in humans
Chemistry - determination of the exact number of molecules in a mole (Avagadro's number); discovery of radioactivity (Rutherford); the invention of nylon (DuPont); Boyle's law (behavior of gases)
Not sure about the answer but I think its the size of the system
Many metabolic prpcesses depend on water such as electron transport chain and glycolysis
I think this answer is probably the minerals
