 I hope that it's not much of a stretch for you to go from a homologous structure like the arm and to carry that back to how did we get that arm? We had to have genes telling us to build an arm. So I hope it isn't a stretch for you to go, but if my genes are saying to build my arm like this and the lion's genes are saying to build its arm like this, might we have similar genes? And the answer is resoundingly yes. And I hope you already knew that. I mean, think about your kids, think about meiosis. Those folks or critters that you are more closely related to, you are going to share more genetic similarities. If you look at chimpanzees who are really closely related to us, we shared a pretty recent common ancestor. And I mean, like millions of years ago, recent, because you know, millions not that much. So we shared a recent common ancestor. We literally share 98%, probably more than 98% of our DNA. It's identical. What? Our DNA is 98% identical to a chimpanzee's DNA. Does that blow your mind? 2% makes us, us, and chimpanzees, chimpanzees. So hopefully, you can accept that we can start sequencing DNA of critters and that provides evidence of evolutionary relationships. That gives us an evolutionary tree, a cladogram, that tells us how things are related. If we were to make an evolutionary diagram, including all of these critters, we really couldn't use forearm or arm anatomy as a characteristic to distinguish between them because they all have very similar arm anatomy. Does that make sense? But we could go back and look at their genetics. Now, we would expect that, you know, mutation is going to happen over time. And we'd expect that the longer, the farther away our most recent common ancestor is, the more time we had to go through meiosis and mitosis and mutate and change to be different from that ancestor. You'd expect to be more different from people you're less related to. We can quantify that. We can count bases and actually see it in action. Wow, that's awesome. And then determine relatedness that way. All right, that was a giant, like, this is what macroevolution is. This is the evidence that macroevolution has taken place on our planet. Now, I would love it if you started exploring, like, what was the evolutionary process that happened in critters on our planet? And wouldn't it be cool if we had critters on a different planet that we could look at and see what their evolutionary process was? But that's another whole issue. Until we have that to look at, I'm leaving now and going to bed. So it's been lovely. Give yourself a high five with your homologous structures. And I'll see you later.