Observe the figure below. the dashed red line with diamond symbols represents the monthly mean values, centered on the middle of each month. the black line with the square symbols represents the same, after correction for the average seasonal cycle.
why does the red line go up and down during the years?
i think the answer is because the average co2 levels increase and decrease throughout the years. but i'm not sure if i'm correct in my thinking .

Choose the most likely outcome of this scenario: jen decided to go bike riding without a helmet. while no one is around during her ride, she is thrown from her bike when her wheel goes into a pothole. she is not injured, but she is terrified to get back on her bike. what happens next? a. her physical health is affected even though she wasn't hurt. b. her mental and emotional health are affected because she is afraid to get back on her bike. c. her social health is affected because she is worried her friends saw the fall. d. her overall health is not affected at all by her fall.