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What is the primary source of energy for the living beings on earth?

The sun, center of our planetary system and star of the milky way galaxy (our galaxy), is the source of the energy that is processed and consumed by living beings. Intense nuclear reactions in the sun liberate light and other energetic radiations in the surrounding space. Some of this energy reach our planet.

How is light from the sun transformed into chemical energy to be used by the living beings on earth?

Light from the sun is transformed into chemical energy contained in organic material by photosynthesis. In photosynthesis light, water and carbon dioxide react and highly energetic glucose molecules and molecular oxygen are made.

What is the chemical equation of photosynthesis?

The chemical equation of photosynthesis is the following:

6 CO2 + 6 H2O + light --> C6H12O6 + 6 O2