What's the Difference Between Sex and Gender?

I think all of us in the world are trying to understand, like what asu sa am i making these days on old fashioned ways of thinking about what sex and gender are. It's so complicated because i think, you know, for me, it's calling one part of the body sex that is potentially dangerous. But biology is so complicated that to say that it's x and y, or testostrone and estrogen, or, you know, whether you have ovaries or testes,. I'd even say a million things that are happening in the body that's trickling up and causing behavior.