Hank introduces us to ecology—the study of the rules of engagement for all of us earthlings—which seeks to explain why the world looks and acts the way it does. The world is crammed with things, both animate and not, that have been interacting with each other all the time, every day, since life on this planet began, and these interactions depend mostly on just two things.
The History of Life on Earth
With a solid understanding of biology on the small scale under our belts, it’s time for the long view—let’s learn how the living things that we’ve studied interact with and influence each other and their environments. This video tells us the epic drama that is the history of life on Earth.