Why is photosynthesis so important on earth?

Photosynthesis is plants taking in water, carbon dioxide, and light to make sugar and oxygen. This is important because all living things need oxygen to survive. All producers make oxygen and sugar for the secondary consumers and then the carnivores eat animals that eat the plants.
Hope this helps

Photosynthesis is important to earth because it's makes sugar and produces oxygen.

True, for example the gulf of mexico is surrounded by the us and spain& mexico.

They create genetic variations