Although Microbes Are Often Equated with Pathogens Not All Are

Although microbes are often equated with pathogens not all are pathogenic and some help humans maintain their health.Which of the following are produced by bacteria that live in the human intestine?

A) Folic acid and vitamin B₁₂
B) Insulin and vitamin K
C) Lipids and folic acid
D) Vitamin K and lipids
E) Vitamins K and B₁₂