Question 1: What activities can increase the amount of atmospheric CO2? More industrial developments that use coal or the increase of cars that use fossil fuel as the source of energy.
Question 2: How could we decrease the amount of atmospheric CO2? Plant more trees, drive cars less, and educate more people how animals and plant are important to the cycle.
Question 3: How does the diagram illustrate the relationship between respiration and photosynthesis? Explain this relationship. In respiration carbon is a byproduct while in photosynthesis carbon is a main ingredient to get the cycle going. So respiration put carbon in the air photosynthesis take it out the air.