Some form spores which can be dispersed by air currents. Some can creep about and engulf food. Habitat is smmonly decaying matter on the forest floor. Some are single celled. They live in water or mud.
Reproduction is by asexual production of spores.
These spores are motile. Important aquatic decomposers. The gamates form a resting spore if conditions are not favorable for growth. These spores are motile. Powdery mildew on grapes.