SOMEONE PLEASE HELP ME ON THIS TEST QUESTION ASAP

Based on the results of this study, what questions remain unanswered? how can these questions guide future research

Which part of cellular respiration must occur before any of the other steps can occur

Which of these is an example of land degradation? a. containers designed to store pollutants leak. b. fertilizers provide too many nutrients to crops. c. garbage is buried so the land can be reclaimed later. d. a drought kills all the plants in an area, leaving bare land