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So this is the first video in chapter 16 which is focused on primate evolution what will eventually build to as we work our way through this chapter is discussing where humans came from how modern humans evolved from higher-level primates but in order to understand that we have to first talk about some general characteristics that all primates share, so we'll go through a couple of things here, and we'll see how all modern primates that have certain characteristics in common, and we'll discuss maybe how some traits in those groups have changed throughout time but the first one to talk about is arguably the most important this is the idea of an opposable first digit so if you look down at your hand you're three are your four main fingers so your index finger your middle finger your ring finger and your pinky finger they are all opposing of your thumb like they're on the opposite side of your hand the reason this is important is we can use the thumb on the opposite side of the other fingers for different kinds of tasks for starters one of the factors here is that the thumb can be used for a very powerful grip if it's set up on the other side of our fingers, and you think about squeezing something very tightly if you're holding on to a baseball bat while you're swinging it something like that that would allow you to have a lot of power in your hands we can also have a lot of dexterity use a very precision based grip if you're using the thumb in opposition to the other fingers, so this could be something as simple as writing with a pencil you're able to use your thumb you can imagine trying to do that without the use of your thumb on the other side of your fingers it would be extremely difficult, so primates are unique in the sense of that opposable thumb making us separate from a lot of other species on the planet another thing that you may have never considered is the idea of what's called binocular vision so if you think about binoculars where the two lenses are on either side of each other that's basically how the eye socket is set up in primates of the eyes are set deep in the skull, and they're on the front of the face what this does are it allows our fields of view to overlap which all use which I'll explain to you using that picture in a minute, but this does two good things for us, it gives us good depth perception, and it makes us a good judge of distance like telling how far away something is so not everything works the same way that primates do if we take a second to analyze this picture you can see that in primates both of the eyes are set in the front of the head whereas on a lot of other species the eyes are kind of set on either side of the head, so we take a look down here this will explain what that does for us there's a section of your field of view where what you're seeing out of your right eye and what you're seeing out of your left eye overlap what that does be it provides us with depth perception people who have lost vision in...
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