Problem: Justin and Thomas are two college students conducting an experiment in their chemistry laboratory course. They are mixing together acids and bases to produce sodium based compounds. Justin conducts his reactions at a high temperature, while Thomas conducts his reactions at a lower temperature. Whose reactions will occur at a slower rate?

A: Thomas

Problem: Spain and Italy participated in a global warming global forum this year. it turns out that Spain uses lots of fossil fuel and natural gas for their economy, while Italy relies on ecological alternatives. Which country causes less global warming?

A: Italy

Problem: The government of Ecuador has been actively pushing to increase biodiversity. They have been quite successful in their pursuit. Moreover, the citizens of Ecuador are receptive about the idea of increased biodiversity. On the contrary, the Government of Oman was not very active in increasing the biodiversity of their country. As a result, Oman, at present, is not very biodiverse. Which place would be less efficient in capturing biologically essential resources, Ecuador or Oman?

A: Oman

Problem: Rob knows a brilliant scientist who has made a time machine. One day, the scientist let Rob travel time with his machine. Rob noticed that the machine had four gears, gear A, gear B, gear C, and gear D. Rob started with Gear A, which represented the present time. Then he pushed the gear to gear B, which was 600 million years from now. Then he further pushed the gear to gear C, which brought him to 800 million years from now. Finally, he pushed the gear to gear D, which brought him to 1.1 billion years from now. Though he traveled time, Rob was always on Earth all the time. When Rob would see less liquid water on Earth's surface, gear C or gear D?

A:
gear D