Why is the sun so important for life on earth?

90% of the energy at any given tropic level is used by the organisms there, thanks to the laws of thermodynamics, which guarantee that everything eventually goes from order to disorder. Without the sun's constant provision of new energy sources, life would soon run out and all living things would perish.

Nearly all producers derive their energy from the sun (a few examples include organisms found in deep sea volcanic vents). These producers are able to absorb solar energy and transform it into organic compounds, which are subsequently utilized by plant producers for metabolism.

The organic compounds that plants produce provide consumers with the energy they need for metabolism; without the sun, plants could not produce the organic compounds that consumers require to survive.

There wouldn't be enough energy for life to exist without the sun.

The sun is crucial for life on Earth because it provides energy through sunlight, facilitating photosynthesis in plants, which is the foundation of the food chain and sustains various ecosystems. Additionally, sunlight regulates the planet's temperature and climate, supporting optimal conditions for life.