First Miraculous One-Celled Creatures?

Who wove first intricate webs of cosmic life? Who formed the waters seeded first earth life? Who put together first miraculous one-celled creatures? For two billion years only single celled organisms exist? Then suddenly zap single celled organisms began to evolve? To evolve into multicellular organisms seeding atmosphere? Who what caused this unexplained unprecedented profusion of life in incredibly complex wondrous forms? Multicellular organisms fill the oceans spanning surface? Why for eons two billion years only single celled organisms then suddenly zap multicellular organisms teem in earth seas? Multicellular organisms adventurers desire crawl from seas?