What happens when photoautotrophs begin to evolve?

When photoautotrophs begin to evolve, they develop the ability to convert sunlight into chemical energy through photosynthesis, using carbon dioxide and water. This process leads to the production of oxygen as a byproduct, significantly altering the Earth's atmosphere and paving the way for aerobic life forms. The rise of photoautotrophs also contributes to the establishment of complex food webs, as they serve as primary producers, supporting a diverse array of organisms. Ultimately, their evolution plays a crucial role in shaping the biOSphere and the planet's ecological dynamics.