1. Light: The sun provides the light that makes life on Earth possible. Plants use sunlight for photosynthesis, which creates the food that fuels the entire food chain. We also rely on sunlight for vision, vitamin D production, and simply to brighten our days.

2. Heat: The sun's heat warms the Earth, making it hospitable for life. Without the sun's heat, our planet would be a frozen wasteland. This heat also drives weather patterns and influences global climate.