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This method is known as radiometric dating. But that does not mean there are rocks available for study for all of these time units. How much of Earth's past had already taken place by that time? He proposed natural selection —which operated on organisms living under environmental conditions that posed challenges to survival—was the mechanism driving the process of evolution forward. Some organisms do not preserve well, and conditions needed for fossilization are only rarely present. Upon death, the phosphatic hard parts were scattered into the rest of the marine sediments. If the inheritance of certain distinctive characteristics is sufficiently favored over time, populations may become genetically isolated from one another, eventually resulting in the evolution of separate species.

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