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| 19.1 Early Thoughts About the Origin of Life 19.2 Current Thinking About the Origin of Life
An Earth Origin for Life on Earth 19.3 The “Big Bang” and the Origin of the Earth
The Formation of the Planet Earth Conditions on the Early Earth 19.4 The Chemical Evolution of Life on Earth
The Formation of Macromolecules RNA May Have Been the First Genetic Material The Development of Membranes The Development of Metabolic Pathways 19.5 Major Evolutionary Changes in Early
The Development of an Oxidizing Atmosphere The Establishment of Three Major Domains of Life The Origin of Eukaryotic Cells The Development of Multicellular Organisms 19.6 The Geologic TimeLine and the Evolution of Life
Adaptation to a Terrestrial Existence HOW SCIENCE WORKS 19.1: The Oldest Rocks on Earth |