Which statement regarding the decreased levels of stratospheric ozone is correct?
a) increased photosynthetic activity has been measured in the phytoplankton around antartica
b) the global crop yields of wheat, rice, and corn have increased since the reduction in cfc use
c) the largest decrease in the level of stratospheric ozone over the arctic region occurs between january and april
d) there is no correlation between the incidence of cataracts and skin cancers and the lower levels of stratospheric ozone
eliminate