In An Inconvenient Truth, a graph of atmospheric carbon dioxide shows a regular decrease in the amount of the gas once a year. What time of year does this happen?

Question

(1 point)
Responses

winter and spring in the Northern Hemisphere
winter and spring in the Northern Hemisphere

spring and summer in the Northern Hemisphere
spring and summer in the Northern Hemisphere

fall and winter in the Northern Hemisphere
fall and winter in the Northern Hemisphere

summer and fall in the Northern Hemisphere

Answer 1

fall and winter in the Northern Hemisphere