Which statement about ozone thinning is true?

A. Ozone thinning is confined to the atmosphere over Antarctica.
B. Ozone levels fluctuate seasonally, with the lowest levels occurring in September and October.
C. Ozone thinning is irreversible since there are no substitutes for CFCs.
D. An international agreement to halt ozone thinning has yet to take place.
E. Ozone thinning only affects organisms living in polar regions.


Answer: B

Environmental & Atmospheric Sciences

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