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Crash Course
What Are Ecosystems? Crash Course Geography
Today we're going to take a closer look at ecosystems -- which are communities of living organisms in an area interacting with their environment -- and how this relationship between the amount of energy a place receives and the movement...
Howard Hughes Medical Institute
Hhmi: Biointeractive: The Geologic Carbon Cycle
A college-level video lecture explaining and discussing the carbon cycle. Gives an interesting perspective on the chemistry of the carbon cycle and how essential it is to the survival of life on Earth. [6:20]