Answer:
Photosynthesis
Step-by-step explanation:
In the information provided it is said that 'used the sun's energy to convert carbon dioxide and water into carbohydrates and oxygen'.
This process is called Photosynthesis shown by this equation here:
CO2+H20 ------> C6H12O6+ O2 +atp
the carbohydrate produced is glucose
it is this reaction that there is life on earth, and still maintains it to this day
Hope this helps!