RNA is a structure capable of being both a store of data and a catalyst. As RNA forms spontaneously with time, eventually you would end up with an RNA which c

RNA is a structure capable of being both a store of data and a catalyst. As RNA forms spontaneously with time, eventually you would end up with an RNA which can catalyse its own ingredients and replicate. As soon as you have one, it would replicate and take over the pool. Random changes would then lead to advancement. Membranes also form spontaneously so the replicating RNA could find itself a bubble through random chance and live in it.