Question: Greg is an environmental scientist. He wants to know how earth's atmosphere differed in two different time. To that end, he selected two time periods, time A and time B. Time A is set in the year one thousand when using fossil fuels was not very common. Time B is set in the year two thousand when fossil fuels are used in large quantities. In which time photosynthesis would make up for the carbon dioxide emission, time A or time B?
Answer: time A

Question: Peter decided to sugar mangoes, ginger, pineapples, peaches to preserve them for next spring. He also bought blueberries and raspberries to eat fresh. Which fruit had a higher sugar content, mangoes or blueberries?
Answer: mangoes

Question: Calving is sitting in his kitchen when he decides to play around with some ice and water. He takes an ice cube out of the freezer and puts it on a plate on his kitchen table. He then takes a glass of water and puts it into the freezer. He is curious to see if the ice cube will melt before the water freezes. Is the sign for the reaction of the ice cube melting positive or negative?
Answer:
positive