This fungus grows on dung and launches its spores in the direction of light toward an open meadow where grazing animals will eat the spore so that Pilobolus can continue it's life cycle. Take a hike in a field or forest or park to find some fresh dung from an vegetarian animal. Sprinkle the dung with a little water. Wait a few days, then watch what happens. The cartoon above depicts a septic tank.
Many homes have septic tanks.
When houses are too far away from each other, each house treats its sewage separately in a septic tank. A septic tank is usually an underground tank that contains billions of microbes that slowly degrades sewage. Septic tanks require a longer time to process sewage than do aerobic waste treatment facilities. This is because septic tanks contain microbes that are mainly anaerobic, that is, they grow without oxygen. Organisms grow faster in the presence of oxygen, just the way that you can run faster when you breathe harder and consume more oxygen.