Its wings and a whale, this is making up its actual fins, it's using them to propel or to control their movement inside of the water. Isn't walking at all, it's using them to flap Part a dog does walk on its front legs a bird Of those animals have very different functions,Ī human does not walk on its hands for the most You see the human forearmĪnd wrist and then you see the homologous Of a, well as a human, we would consider a forearm. Similar position, similar ancestry but not necessarily Means things that have similar structure, Homologous structures, that you see throughout So the first thing I want to talk about is homologous structures, Loads and loads of any type of this evidence. I encourage you to do more research on it. Structural and this is a very high-level overview. Occur over time scales of millions or tens of millions of years, it actually can occurĪnd we see it occurring all the time on scales well within a human observational capacity, Happening and as we'll see, evolution does not only Observing things, well you know it's for sure No one was around to really "observe, even if we seeĪ lot of evidence, no one "knows if it for sure happened." But if you're directly Says it happened over tens "of millions of years but ![]() Say "Oh, it's a theory, "you know, the theory And then the last dimension we'll look at is direct observation, direct observation, and this is really where We've learned, really over the last 100 or so years,Īt the micro level, in microbiology. With our eyes or with a very simple microscope. Things that we can for the most part observe Selection starts to make a lot more sense of it,Īnd here we're talking about the macro structure, That people have been observing in biology for a long time but evolution and natural Of things that folks like Darwin would have observed, Go into three types of evidence in this video for evolution and natural selection. The progress we've made in biology frankly wouldn't make any sense and probably would not have happened. It's a theory, evolution "is it just a theory?" Well, it's about as strong as theories get and without it, as Theodusĭobzhansky said, biology as we know it and all of Stronger evidence, so a lot of times people say "Oh, Microbiology and genetics, which gives us even We have our tools aroundĭating and the fossil record, which gives us much more evidence. The observations we had up until that point. ![]() We've had far more tools to back it up beyond just And since Darwin hadĬome up with this theory in the mid-19th century, Of evolution, biology was just about observationĪnd classification without having a cohesive narrativeįor how all of this came about. The evidence for evolution and natural selectionĪnd to understand them, because before the theory ![]() True and this is why it's so important to appreciate The light of evolution." This is by Theodusĭobzhansky, who's a famous biologist, he's passedĪway now, and what he's saying is absolutely Quote "Nothing in biology makes sense except in Selection explaining them, but I thought I would doĪ video going a little bit more in depth in evidence for evolution and natural selection. Many videos on Khan Academy on evolution and natural
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