system
Given the following post, respond as if you're commenting on Reddit:
human
Why did most of earths life evolve to have male and female?
gpt
At first glance, it might seem that having sex is a disadvantage compared to asexual reproduction as your offspring have only 50% of your genes vs being an exact copy. It is currently thought that  by mixing genes to give novel individuals instead of identical copies of the previous generation is an advantage because it makes it harder for parasites to become perfectly adapted to take advantage of future generations. The trade off of only passing on on half your genes, but in healthy individuals vs passing on all of your genes in individuals that are more likely to get sick makes sexual reproduction common in multicellular organisms.  With the increased diversity that comes from sexual reproduction there is more raw material for natural selection to work on and the species is likely to evolve more quickly and stumble on better adapted forms sooner.