Well well well, here’s a rabbit hole to go down! Think about the variety of life on earth today, and continuing to be discovered more every day. But how about the life before that, before the dinosaurs, before any of the 5 great extinctions? We have a limited amount of fossil proof… so limited in fact, that we know of only an estimated 1% of life that has existed on our planet. The rest? Completely up to our wildest imagination.