For a given upward sloping supply curve, the more elastic the demand curve the higher the proportion of tax borne by the producer; indicate if the statement is true or not and explain your answer

Without stratospheric ozone, which of the following would most likely occur? i. smog over major cities would be greatly reduced. ii. farms would produce surplus crops because of increased photosynthesis. iii. uv radiation would damage phytoplankton and reduce populations of aquatic consumers. i only ii only iii only i and ii i and iii