What impact does an asteroid have on the biosphere?

An asteroid impact can have catastrophic effects on the biOSphere, primarily through the release of immense energy leading to widespread fires, tsunamis, and a "nuclear winter" scenario. This can drastically alter climate conditions, blocking sunlight and disrupting photosynthesis, which affects plant life and subsequently the entire food chain. The resulting environmental changes can lead to mass extinction events, as seen with the dinosaurs approximately 66 million years ago. Ultimately, such impacts can reshape ecosystems and biodiversity for millions of years.