Bacteroidetes
Bacteroidetes have many roles but primarily breakdown large organic matter such as proteins and complex sugars into smaller molecules. Members of Bacteroidetes can be both helpful and unhelpful to humans to humans and plants. Some members are involved in metabolism and breaking down food. On the other hand, some members are pathogenic, they cause disease in humans. Members of the genus Bacteroides are opportunistic pathogens. Rarely are members of the other two classes pathogenic to humans.