Scientists are constantly discovering new forms of symbiosis, which are considered the driving force of evolution.
It was the most consequential union that ever existed on this planet. About 1.7 billion years ago, several primordial microbes merged into a far larger and more complex cell type: the eukaryotic cell. All higher life emerged from it. Without this event there would be no plants, no animals, no fungi. And probably no life on land either. Because in a second decisive event, fungi and algae, which had allied themselves and which under the label "lichen" conquered foreign territory...
