What is the role of normalization?

"margin-bottom:14.0pt;mso-pagination:none;mso-layout-grid-align: none;text-autospace:none">

In broad-spectrum, normal flora are not invasive and do not usually

cause disease. They occupy niches that supply their requirements

for nutrients, oxygen and space to reproduce. They may provide some

benefits in unknown vitamins, or some discomfort as they produce

gas from undigested food.