It helps you digest your food

An anaerobic organism or anaerobe is any organism that does not require oxygen for growth. Examples are gut flora, skin flora, and bacterial disease.

Unicorns and nyan cats break up your food in your guts

The human intestines are filled with what is known as gut flora. Gut flora is microbia found in the digestive tract that consists of Bacteroides, Clostridium, Fusobacterium, Eubacterium, Ruminococcus, Peptococcus, Peptostreptococcus, and Bifidobacterium.