What is the most important reason that the steep increase in infecious disease?
A.Neolithic humans produced more stable and varied food sources.
B.Neolithic humans' life span is shorter.
C.Domesticated animals make it a new way for pathogens to behave in the world.
D.Neolithic humans have poor living stantard.
E.Neolithic humans experienced population increase.
正确答案是E