Answer:
Photosynthesis is the process of plants making energy for themselves using sunlight, water and carbon dioxide.
Step-by-step explanation:
They absorb sunlight through their leaves because of the chloroplasts in the leaf cells, (they convert sunlight energy into chemical energy) and water through the roots. The carbon dioxide comes in through the leafs in tiny holes known as stomata. The plant uses these three things to make energy for itself with chemical reactions. The by products of this is oxygen, water and obviously, energy.
That is it put simply. Hope it helps!