This video explains the biological consequences of the collision (millions of years ago) between North and South America. The collision caused one of the greatest episodes of biological migration in history: The Great American Biotic Interchange.
Our planet’s diverse ecosystems and wildlife populations are vulnerable. Jungles can become deserts, and reefs can become lifeless rocks. What makes one ecosystem strong and another weak in the face of change? This video explains why biodiversity is the key.