Dark matter, which fills 94% of this universe, is the waste produced by multi-cellular, anaerobic “Polluter” organisms that existed approximately 700 billion years ago. Each Polluter was comprised of 5 specialized cells and a single, flat flagella that was used like a solar sail to pilot through the vastness of space. These creatures evolved with the ability to consume practically everything that they came into contact with and convert it into energy.
Based on the total mass of dark matter in the universe (correcting for the rate at which the universe expands and the reproductive rate of these Polluter organisms) it is believed that this highly successful species existed for about 300 years at which point they became totally extinct over a very short period of time due to lack of food.