So, can you see how similar structures they are? The number of bones and the kind of bones are very, very similar to each other. And then we have fingers, finger bones, and finger bones. Then you get the hand bones over here, five of them, but there are only four here, again five of them. Then we get the wrist bones, wrist bones, wrist bones. Over here we see one bone, one bone, one bone. So if I color them, now look at these bones carefully. Look at them, do you see similarities? To make it more clear, let me color them appropriately. Approximately this is how the bones would be. If we zoom in a little bit, let me zoom in to the wings and the flippers and the hand, and here are the bones, look at them. So if you take a look at the wings of a bat, the flippers of a dolphin, and our hands, then, although they look very different and they perform different functions, you look carefully, look at their bone structures, you will find the bone structures are very similar. To avoid confusions, let's get rid of this picture and start fresh. And on the other hand, we will see that, although some other structures might look very different and perform different functions, they can be related to each other. And so in this video we will explore why certain structures, which might look similar and perform same function, did not necessarily mean that they are related to each other.
And in fact it turns out, surprisingly, it's these two structures are more closely related than these two, or these two. But it turns out that in reality, they are not as closely related to each other. They look very similar and they're both used for swimming, so we could say, "Hey, maybe they are very related "to each other." And similarly, if you look at the wings of the bat, let me use a different color, wings of a bat, and the wings of, say, an eagle, again, both are used for flying, they look kind of similar, we might say they are related to each other. For the dolphins we don't call them as fins, we call them as flippers. In these pictures, we might look at the fin of the shark, and say they are very similar to the flippers of a dolphin.
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