Humans are more closely related to fungi than other kingdoms. Humans share same pathogens with fungi. Fungi don’t like rot from bacteria – our best antibiotics come from fungi. Fungi don’t need light, using radiation as energy source.
Fungi were first (1.3 billion years) organisms on Earth. Plants followed few hundred million years later.
Mycelium reduces oxalic acids/enzymes that pockmark rocks, forming calcium oxalates from minerals and CO2. First step to soil creation. Mycelium also converts cellulose into fungal sugar (ethanol).