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What is especially interesting is that the fossils do appear to show a progression from the most "simple" of organisms, such as single celled creatures like bacteria, to the most "complex" organisms, such as vertebrates, mammals, and of course humans.This evolutionary progression seems to be clearly demonstrated in that certain kinds of creatures in the upper layers are rarely if ever seen in lower layers.Of course, this is a very general pattern and does not explain why certain creatures that lived on the bottoms of oceans, like trilobites, make their first appearance in the Cambrian (505-540 Ma) while other creatures that live on ocean bottoms, like crabs and lobsters, don't appear until the beginning of the Cretaceous (65-145 Ma).Why would creatures that would seem to share the same general environment while alive be so widely separated in the fossil record if they did indeed live at the same time and in pretty much the same location?The scientific method can only disprove theories or increase the power of previous predictions that have yet to be disproved, but it can never absolutely prove anything to be absolutely true.

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Sites that encompass a greater area tend to have more species (Rosenzweig, 1995).Since each of these layers seems so specialized it is easy to conclude that one type of creature gave rise to the next type of creature over the course of whatever time it took to form the various layers between them.Radiometric dating and many other techniques are used to support the idea that this transformation process took tens and hundreds of millions of years.Many of the layers also show a certain specialization.Some layers contain mostly fish fossils while others contain land-dwelling creatures such as dinosaurs.

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    In contrast to the women, each man I lock eyes with around the circle is like a nervous ball of energy. I also wear a dress which is floor-length, but only at the back. We are at a yoga studio in Manhattan on a Tuesday evening, dating for a Tantric speed dating session to begin.