In nature, organisms use a variety of methods to figure out where they are and where they need to go. Plants use sunlight and gravity to determine which direction to grow, birds migrate in part using the sun and the stars to guide them.
Humans simply can ask for directions.
One type of bacterium has an internal compass. It uses the earth s geomagnetic field to navigate. These bacteria are called magnetotactic bacteria, because they make chains of tiny, iron-containing magnets. This magnet chain is their compass, and it tells them which way is north. Magnetotactic bacteria dislike oxygen.