Naturalistic evolutionists often claim that the strongest proof of their theory is found in the science of paleontology. If naturalistic non-life to human life evolution is true, multi-billions of links are required to bridge modern humans with the chemicals which once existed in some primitive "soup" found in the ocean or mud puddles and which were assumed to have given birth to life more than 3.5 billion years ago. Furthermore, these multi-billions of intermediate links would be a prominent part of the fossil record. And multi-millions more links are needed to connect humans with our primitive apelike ancestors that are hypothesized to have existed eons ago. Scientists tend to find fossils of comparatively "simple" life forms in the "older" layers of earth strata, and the so called "higher" forms of life are more common in the more "recent" strata. It was therefore assumed that, as new layers were deposited, the fossils being formed in them would reveal a clear picture of life progressively evolving from comparatively simple to complex forms. Unfortunately for evolutionists, this is not what has been found in the record of the rocks.