Consider the endosymbiosis theory for the origin of the mitochondrion. how did each endosymbiotic partner benefit from the relationship?

According to endosymbiosis theory, the mitochondria was once free-living prokaryotic cell. The cell was engulfed by other cell (host cell) via the process of phagocytosis.

The “eaten” cell survived inside the host. The host cell provided a nutrition and safe environment to live and the future mitochondria produced energy that the host cell can use. Over time the organelle and the host cell have evolved together.  

it's the release of intestinal gas, which forms as a result of digesting food. when partially digested carbs reach the colon, bacteria convert part of that food into hydrogen and carbon dioxide gasses. you cant stop the stink, its a gas that comes naturally.

explanation:

voluntary muscles are controlled by the cerebellum.