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Cell and Molecular Biology for Environmental Engineers by Ryan Rogers

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CHAPTER 7

EVOLUTION PATTERNS AND PROCESSES

7.1 DESCENT WITH MODIFICATION

Evolution is a theory that is both chemical and biological in nature. Chemical evolution is characterized as the combination of simple chemical compounds in the early atmosphere forming larger, more complex substances, which eventually culminated in what we know as life. The last universal cellular common ancestor is proposed to be the product of this initial chemical reaction, which provided characteristics of life that are still shared by all living organisms on Earth today. With this striking relationship between chemistry and biology, it is important to understand that changing environmental composition can ultimately result in biological evolution and diversification ...

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