Fungus is everywhere. One of the largest organisms in the world is actually a huge fungus over 2 miles across, growing in Oregon. Fungi might have even been the first organisms to live on land, and mushrooms covered the earth's surface after the world's worst mass extinction event -- feeding off all the dead plants and animals. So it might not be cockroaches that inherit the earth, but fungus. And if we ever find alien life, it could look more like mushrooms than humanoid life.
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