Hey Mr. Wood, its Melanie from 6th period and I am going to try to answer the questiond about carbon balence. 1.The graph shows about 387.6 concentration (pm). 2. This data was collected either early in the morning or late at night because the levels of carbon are so low where as in the afternoon it would be higher because of the sunlight hitting the ground. 3.I think the amount of CO2 will be higher in two hours because the sun will be out causing more of the CO2 to form. -Melanie P. 6