Molecular systematics helps the biologist to interpret the fossil record to assume the evolutionary history of animals. The scanty availability of fossils is always an obstacle for the biologist to detect the rate of divergence, age, and the number of branches of the animal groups. Based on major geologic, biological events, and climate, geologists divided the history of Earth into units of time.

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Chapter 21, Problem 6TYU

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Concept introduction: Molecular systematics helps the biologist to interpret the fossil record to assume the evolutionary history of animals. The scanty availability of fossils is always an obstacle for the biologist to detect the rate of divergence, age, and the number of branches of the animal groups. Based on major geologic, biological events, and climate, geologists divided the history of Earth into units of time.

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