Learn about the nitrogen cycle, its importance to ecosystems, and how it works.

Learn about prokaryote metabolism and nutrition on Khan Academy.

The phosphorus cycle article on Khan Academy explains the process of phosphorus cycling through ecosystems, including its sources, sinks, and environmental impact.

The carbon cycle is a process where carbon atoms are recycled through the Earth's ecosystems.

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Learn about fermentation and anaerobic respiration in the context of AP Biology on Khan Academy.

Learn about the nitrogen cycle and how it impacts ecosystems and biodiversity.

Descubre el ciclo del nitrógeno y su importancia en los ecosistemas con Khan Academy.