- Apr 17, 2006
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How?Earth existed for over 4.8 billion years however, there were only simple, bacteria like organisms until the late Cambrian period. It was the last 500 million years where the complex life appeared and all the diversification happened and I think it is too short a period for millions of species - 8.7 million species presently and researchers believe 99.9% species are extinct - to evolve (without Creator, of course).
Now that we talked about the life in the Cambrian period, there was this event known as Cambrian explosion which still remain as a thorn in the flesh for Evolutionists.
Cambrian explosion - Wikipedia.
Environmental changes allowed for hard body parts and new niches opening. This both created the pressure for species to diversify and the opportunity for fossils to form. There is some evidence for complicated life before the Cambrian... just that there's very limited opportunity for fossils from this era to still be identifiable today.
A good modern example is the octopus. They are extremely complicated animals... but naturally they are very unlikely to leave fossil evidence because their soft bodies could just be consumed and destroyed.
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