I'm not sure if this is exactly correct, but to complete photosynthesis, plants need carbon dioxide and water. Usually sunlight as well. If you are supposed to be specific, you could put H2O. I hope I answered your question!
Answer:
sorr i practicing spanish
Explanation:
Todas las partes del cuerpo (músculos, cerebro, corazón e hígado) necesitan energía para funcionar.