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Around 4 billion years ago, oceans began to condense on earth while volcanic eruptions released nitrogen, carbon dioxide, methane, ammonia, and hydrogen into the primordial atmosphere. However, organisms with the characteristics of life were not initially present on earth. Scientists have used experimentation to determine how organisms evolved that could grow, reproduce, and maintain an internal environment.

Conditions on Early Earth

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Around 4 billion years ago, oceans began to condense on earth while volcanic eruptions released nitrogen, carbon dioxide, methane, ammonia, and hydrogen into the primordial atmosphere. However, organisms with the characteristics of life were not initially present on earth. Scientists have used experimentation to determine how organisms evolved that could grow, reproduce, and maintain an internal environment.

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Examining the Characteristics of Episodic Memory using Event-related Potentials in Patients with Alzheimer's Disease

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Earlier days

Nicholas J Strausfeld¹

¹Division of Neurobiology, University of Arizona-Tucson, Arizona, USA. flybrain@neurobio.arizona.edu

Journal of Neurogenetics

|November 26, 2008

Summary

No abstract available in PubMed .

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