Photosynthesis is the process in which light energy of the sun is converted to chemical energy. The oxygen so released is used in the respiration process to break down complex molecules and releases energy in the form of ATP molecules.
Based on your knowledge of the carbon cycle, what do you think might happen if humans were to continue to clear and burn vast areas of forests for building? Eventually we would run out of forests and the air would be very polluted. Explain how a nutrient can be a limiting factor in an ecosystem.
I believe the answer is answer D- Nuclear decay rates are constant.
~ Good luck!