that's the point of evolution. macro molecules develop first. these are molecules that can replicate themselves with materials around them and no form of consciousness or sentience. then these eventually produce organelle or what we would now call organelle anyway (as organelle - except for the nucleus - were separate species iirc) now these organelle will interact with each other by pure chance and eventually these will form single celled organisms which can photosynthesise (and some of these cells start to form plants) which slowly created an atmosphere that could support animal life. now a lot of these macro molecules remain as they won't all end up as organelle. now some plants begin to evolve shrinking the vacuole and reducing the cell wall's thickness. this combined with the absorption of mitochondria, which was its own species, now this meant that it just needed a source of glucose to evolve away from having chloroplasts so eventually these random interactions will form a single cell organism which can consume part of a plant or other cells to access glucose and there is oxygen in the air so it can now evolve to remove chloroplasts as it no longer needs them. now these would be evolving in many areas around the earth (whether you think it's curved or round) so they can now begin evolving even further becoming multicell organisms which then begins to develop a food chain. this brought around dinosaurs which were eventually subject to mass extinction. then complex life begins to evolve again from those that survived and single celled organisms once again which eventually creates *homo sapiens* and all of the other species that we see today
