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| What do you do? http://wallpapers.in.net/ sexy girl wallpaper The dawn of the Cambrian period divides two very different Earths. In one, primitive, mostly single-celled creatures 창��혵sat on the mud and did very little,창��혶 says evolutionary biologist Matthew Wills of the University of Bath in the United Kingdom. In the other, life forms as diverse as our modern fauna roamed the planet. The abrupt appearance of these creatures in the fossil record 창��혵gave Darwin a headache,창��혶 Wills says, and critics of evolution have argued that the tree of life couldn't possibly produce so many branches and bear such a variety of fruit so quickly. |
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