Think about it - Homeostasis is hard work. Just to stay alive, organisms and the cells within them have to grow and develop, move materials around, build new molecules, and respond to environmental changes. Plenty of energy is needed to accomplish all this work. Where does all that energy come from?
Why is ATP useful to cells?
What happens in photosynthesis?
What role do pigments play in photosynthesis?
What are electron carriers?
What are the reactants and products of photosynthesis?
What happens in the light-dependent reactions?
What happens in the light-independent reactions?
What factors affect photosynthesis?