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Originally Posted by servantofone  And where do you get that figure and where is it derived from? Even a resource would be nice. |
Try google.
Precambrian - Wikipedia, the free encyclopedia Quote:
Life before the Cambrian
For more details on this topic, see Origin of life.
It is not known when life originated, but carbon in 3.8 billion year old rocks from islands off western Greenland may be of organic origin. Well-preserved bacteria older than 3460 million years have been found in Western Australia.[6] Probable fossils 100 million years older have been found in the same area. There is a fairly solid record of bacterial life throughout the remainder of the Precambrian.
Excepting a few contested reports of much older forms from USA and India, the first complex multicelled life forms seem to have appeared roughly 600 Ma. A quite diverse collection of soft-bodied forms is known from a variety of locations worldwide between 542 and 600 Ma. These are referred to as Ediacaran or Vendian biota. Hard-shelled creatures appeared toward the end of that timespan.
A very diverse collection of forms appeared around 544 Ma, starting in the latest Precambrian with a poorly understood small shelly fauna and ending in the very early Cambrian with a very diverse, and quite modern Burgess fauna, the rapid radiation of forms called the Cambrian explosion of life.
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The point I have in wanting the probability behind it is the fact that I really think that if you worked it out, it would be much longer than 3.8 billion years to get to the amount of life and complexity of life we have today.
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Can you even fathom that? 3.8 billion years isn't enough time??? Can you even imagine 1000 years??? What about a million? That is a loooooooooooooooooooooonnnnnnnnnnnnnnnnggggggggggg gggggggggg time. I can't even fathom 1 million years, let alone a billion!