The previous video clip introduced us to the life of Darwin and some of some of his key evolutionary concepts (e.g., natural selection and artificial selection).
We've talked previously about what a theory is. We've defined it as an explanation of how or why something works.
To get a good grasp of what a theory is, let's start by looking at a theory from the field of biology
One of the best explanations of biological evolution and the mechanism that drives evolution is found in Carl Sagan's Cosmos video series which was based on the book Cosmos. In the following video Sagan describes the process of artificial selection. As you are watching this clip from Cosmos, be sure to identify and be able to explain the mechanism that drives evolution.
Let's start first in Japan some time ago and the story of a drowned boy-emperor, a small crab and the idea of artificial selection.
In this short clip the process is explained in a different way. Slow the process down and catch each step. It starts with organisms vary.
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