Question

Question 186 (1 point) There is an annual rise and fall in atmospheric CO2 concentration. What is the primary reason for this? Seasonal cycle in contrail formation by jet airplanes Plant growth during the northern hemisphere summer removes atmospheric CO2 for photosynthesis, enough to cause a global reduction Fossil fuel usage increases in winter months Plant growth during the southern hemisphere summer removes atmospheric CO2 for photosynthesis, enough to cause a global reduction Question 187 (1 point) Coring can create climate logs than span from hundreds to millions of years (choose the best answer) Tundra

Answer 1

option C). is correct i.e. fossil fuel usage increases in winter month.

option b) and d) is not the primary reason because when there is summer in northern hemisphere then it must be winter in southern hemisphere and we know that plant do photosynthesis and respiration, take up the gas in spring and summer, and release it in fall and winter.So it makes a balance. and option a). is clearly wrong because jet aeroplane is not the reason for this.