lichen

Lichens are composite organisms!

Lichens are composed of a fungus along with some sort of photosynthetic organism such as an algae or cyanobacterium. One reason that this is totally insane is that fungi, plants (algae), & bacteria come from three totally different kingdoms of life. Their last common ancestor existed around 2 billion years ago, yet somehow they are able to live in harmony!

Behold one of the greatest wonders of the natural world!