Submitted by sadim6 t3_10d9m2s in askscience
Creationists love to claim that the existence of eyes disproves evolution since an intermediate stage is supposedly useless (which isn't true ik). But what about sexual reproduction - how did we go from one creature splitting in half to 2 creatures reproducing together? How did the intermediate stages work in that case (specifically, how did lifeforms that were in the process of evolving sex reproduce)? I get the advantages like variation and mutations.