Later This site tells the story of the history of the universe. Click Earlier and Later to follow the story.
Prokaryotes are very small cells that have no membrane around their nucleus nor any organelles .
Prokaryotes include bacteria . They are the simplest organisms on Earth, and also the commonest. Every part of your skin is smothered in them. Their spores fill the air we breathe. Every glass of water we drink, even good clean drinking water, contains millions of them.