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Keep going! Check out the next lesson and practice what you’re learning:
https://www.khanacademy.org/science/biology/ecology/biogeochemical-cycles/a/the-water-cycle

Thinking about how key elements are cycled through ecosystems.

Watch the next lesson: https://www.khanacademy.org/science/biology/ecology/biogeochemical-cycles/v/the-water-cycle

Missed the previous lesson? Watch here: https://www.khanacademy.org/science/biology/ecology/intro-to-ecosystems/v/flow-of-energy-and-matter-through-ecosystems

Ecology on Khan Academy: Why are polar bears found only in the Arctic? Why does mildew grow in your shower and not (hopefully) in your sock drawer? Learn how ecologists study the interactions between organisms and their environment, and how these interactions affect where, and in what numbers, different types of organisms are found.

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