David collects cigarette packs of different years. He found that two of his packs, pack A and pack B, are very different. Pack A is from before September 2012, and pack B is from after September 2012. He started searching on the internet to find out why the packs were different. Which pack would be less efficient at communicating dangers of smoking, pack A or pack B?
Ans: pack A

Two sister cities had different environments. Shanghai had big problems with air pollution while Berna took very good care of the surrounding environment and air quality. Which city had people at increased risk of dying from other diseases?
Ans: Shanghai

A scientist is observing two chemicals react. The reaction is very slow and he wants to find a way to speed up the reaction. One day the labs air conditioner breaks, increasing the heat, in the lab and he notices the reaction is happening significantly faster than usual. Will the chemicals the scientist used react faster or slower if you decrease the temperature?
Ans: slower

Rob is an environmental scientist. He was doing a study on agroforestry. To test the sustainability of agroforestry he conducted two pilot projects, pilot A and pilot B. In pilot A, he used a land for agrofroestry. In pilot B, he used a land for usual row-cropping. He needed to find the pros and cons of both systems. Which project would have less soil cover, pilot A or pilot B?
Ans: pilot B