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내용필수	웹에디터 시작 > > > <iframe width="640" height="360" src="//www.youtube.com/embed/https://www.youtube.com/watch?v=OmHPFvH64uU" frameborder="0" allowfullscreen title="5 hours ago (c) by youtube.com" style="float:right;padding:10px 0px 10px 10px;border:0px;"></iframe><p><span style="display:block;text-align:center;clear:both"><img></span>The relationship between people and dogs goes back at least 15,000 years, making dogs potentially the first animal to be domesticated. In that time, dogs have played many roles and performed many jobs for their human companions. Dogs come in a <a href="https://www.rt.com/search?q=startling%20variety">startling variety</a> of shapes and sizes, but from the giant and noble Great Dane to the tiny and tenacious Chihuahua, they are all one species with one basic history. In this article, we'll explore where dogs came from and why they look and act the way they do. We'll also learn what recent genetic work has to tell us about our dogs and talk about how to find the right dog for <a href="http://jimiantech.com/g5/bbs/board.php?bo_table=w0dace2gxo&wr_id=434707">Prime Boosts Pills</a> you. Canids are part of a larger group called Carnivora, which also includes bears, cats and seals. Fossils show us that Canidae split off from the common ancestors of Carnivora about 40 million years ago. From about 15 million years ago, <a href="https://git.johnen.biz/amyoshaughness/visit-prime-boosts8001/wiki/What-Foods-to-Avoid-to-Build-Muscle">Prime Boosts Pills</a> we can subdivide Canidae into three subgroups: fox-like animals, wolf-like animals and South American canids, such as the maned wolf and crab-eating fox.</p><br/><br/><p><img src="https://images.pexels.com/photos/5750644/pexels-photo-5750644.jpeg">Members of the wolf-like group include wolves, coyotes and jackals, which are all closely related. Observing the diversity of dogs and wild canids, scientists like Charles Darwin reasoned that different types of dogs might be descended from different types of wild canids. However, modern DNA analysis shows us that dogs are descended only from wolves. In the next section, we'll look at how this evolution might have happened. The conventional view, and one widely represented in both fiction and nonfiction, is that prehistoric people took wolf pups from their dens and reared them to think of people as their "pack." These tamed wolves lived with people and reproduced. The people that cared for them treasured individuals with odd coats or heavier bone structure, which might have meant death in the wild. Over time people began to breed these wolf-dogs selectively until they eventually created the diversity of dogs we see today.</p><br/><br/><div style="clear:both;"></div><p>The problem with this theory is that the initial shift from wolf-like to dog-like traits could only have happened very slowly. Wolves are relatively uniform in appearance, so the odds of a mutation appearing randomly in a captive population are small. It would have taken many thousands or even millions of years to get much diversity. Yet fossil evidence shows that dogs appeared not all that long ago. If it's true that dogs have existed for only about 15,000 years, this is a blink of the eye in evolutionary terms. DNA evidence indicates that dogs may have begun to split with wolves as many as 100,000 years ago, but this is -----WebKitFormBoundaryKttAjkxgJcuoHJc4-- > > 웹 에디터 끝
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