 You know, so after all these life forms I just mentioned occur, soon something called one branch ended up just being a little more symmetrical. It's called bilateria, basically just means bilateral. It ended up looking like a worm. So you have jellyfish pulsing through the ocean. And then, you know, one branch gradually through evolution kind of settled on the bottom and became more two-dimensional and kind of scuttled around like a worm would through the sand.