1. There are not just two genders
Naturally, nature works. In fact in detail, everything is quite complicated. But to stay sane, we Human beings need to simplify things. Like tables generally have four legs and a plate. Or most often. Or at least they are made to put stuff on them and sit around them on chairs. Or stand in front of them and do stuff with things on them.
Take a closer look at bees and ants. Or go look up Humon Animal lives. Or Schizophyllum.
2. Genders are...