Wait But Why offers a crudely-drawn-yet-still-awesome history of evolution, taking us back through time:
I don’t know what to tell you. This is a part of your lineage.
I want you to pause and just ponder for a second that I’m not inventing silly shit here — if you take your father, and your father’s father, and do that 435,000,000 times, you’ll end up at a jellyfish. Evolution is boggling.