Hay Mr.Wood! It's Rachel from period 1. For #1 the highest CO2 is around 388 parts per million and the lowest is 386 parts per million and the most common is around 387 parts per million. #2 is the time of day is afternoon to late afternoon. And #3 is the measure of CO2 would move down because by the end of the graph it is starting to go down. Hope to hear soon! -Rachel