Respuesta :

The three things needed for photosynthesis are: energy (light), carbon dioxide, and water
Three things that needed for photosynthesis is: 
1. Carbon Dioxide 
2. Energy (The form of Sunlight)
3. And Water.

The Chemical Equation is:
6 CO2 + 12 H2O + energy -->C6H12O6 + 6 O2 + 6 H2O