Which of these answers best describes the relationship between humans and most of their skin and intestinal normal microbiota?
A) Commensalism - The human benefits from the microbiota, while the microbiota is neither harmed nor benefited.
B) Mutualism - Both the human and the microbiota benefit from their relationship.
C) Parasitism - The microbiota benefits at the expense of the human.
D) Competition - The human and the microbiota compete for resources, with one being favored over the other.
