History of Life on Earth
A look at the theories of how life began on Earth and how it evolved over time. Information includes the endosymbiont theory, primordial soup, hydrothermal vent theory, among others.
Early Life Theories - Primordial Soup
Explanation of the theory and experiment centered around how "primordial soup" led to life on Earth.
Early Life Theories - Hydrothermal Vents
Hydrothermal vents in the ocean could be the place where life on Earth began.
Early Life Theories - Panspermia Theory
The Panspermia Theory asserts life came to Earth on meteors
Endosymbiotic Theory
The endosymbiotic theory explains how cells evolved
The Geologic Time Scale
An outline of the Geologic Time Scale.
Precambrian Time Span
The earliest of the time periods on the Geologic Time Scale, the Precambrian Time Span saw the first signs of life on Earth.
Paleozoic Era
A brief look at the Paleozoic Era on the Geologic Time Scale.
Mesozoic Era
A brief description of the Mesozoic Era on the Geologic Time Scale.
Cenozoic Era
A brief description of the Cenozoic Era, the most recent era on the Geologic Time Scale.
Mass Extinction
A brief definition of mass extinction and how mass extinctions contribute to the evolution of species.
The Oxygen Revolution
There was no oxygen in the atmosphere on early Earth. This is how the oxygen revolution happened.
A Brief History of Life on Earth
A short article on possible ways life began on Earth.
Miller-Urey Experiment
A brief overview of the "primordial soup" experiment done by Miller and Urey to show a way life may have begun on Earth.
Geologic Time Scale - Precambrian Time
A look at the very beginnings of life on Earth and how it change throughout the Geologic Time Scale.
The Evolution of Cells
How cells came about, including the endosymbiont theory of eukaryotic cells.
From Soup to Cells - The Origin of Life
A quick guide to different theories of how life began on Earth.