The correct answer is natural selection. C is the answer!
Bacteria has a stronger resistance that usually produces even more resistant bacteria, and the cycle just repeats itself, making more and more resistant bacteria. This process is called Natural Selection.
Hope that helped!
-Chris
Dominant. Lowercase would be recessive.
Hypothesis and conclusion
Endocrine plays an important role in the regulation of metabolism, reproduction, water balance, and many other functions. I needed to type a lot but the answer is endocrine.