Which version of the origin of species?

[mamamia88]

i know evolution isn't an origin story i'm just trying to trace it back to the beginning. i mean if all life on earth at one point or another was single celled it had to somehow become multi celled. but, if single celled organisms where already super efficient at reproducing where is the motivation to evolve further? @chuck will check that out still want to read the original version though even though it seems so simple in it's basic concept