Select the correct answer from the drop-down menu. Sam wants to grow in his current role, and he decides to take a three-month skill enhancement course. Sam is demonstrating .

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