19.1 Early Thoughts About the Origin of Life
19.2 Current Thinking About the Origin of Life
An Extraterrestrial Origin for Life on Earth
An Earth Origin for Life on Earth
19.3 The “Big Bang” and the Origin of the Earth
The “Big Bang”
The Formation of the Planet Earth
Conditions on the Early Earth
19.4 The Chemical Evolution of Life on Earth
The Formation of the First Organic Molecules
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
Cellular Life
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
An Aquatic Beginning
Adaptation to a Terrestrial Existence
HOW SCIENCE WORKS 19.1: The Oldest Rocks on Earth
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