Question

write the three things required for photosynthesis here.

Explanation:

Photosynthesis is a process in plants (and some other organisms) that converts light energy into chemical energy. The three key requirements are: 1) Carbon dioxide ($\ce{CO_2}$), which is taken in from the atmosphere. 2) Water ($\ce{H_2O}$), absorbed by the roots. 3) Light energy, typically from the sun, which is captured by chlorophyll in chloroplasts.

Answer:

1. Carbon dioxide ($\ce{CO_2}$)
2. Water ($\ce{H_2O}$)
3. Light energy (from the sun)