Bacteria, a group that does not use oxygen to thrive at the bottom of the bottle. The group that needs oxygen to thrive, there will be growing on the surface of food and growing group in that there is no oxygen, and oxygen.
Anaerobic bacteria will grow on the bottom of the bottle. Groups that need oxygen to grow to grow on the surface of the food and grow in the absence of oxygen and oxygen.
Bacteria that do not use oxygen to thrive the bottom of the bottle. The group wants to oxygen in the growth is growth on the surface of the food and the group that has in no oxygen, and oxygen.