Question: A group of researches studied the green house gas emissions and their effects on Earth and people during the eighties compared to the twenties. The eighties produced way more green house gasses than the twenties did. During which decade did Earth experience a decreased average global temperature?
Answer: twenties

Question: Mike is studying for his biology exam. He found that all body cells are not equal in size - some are large and some are small. He labeled the large cells as class A cells. Then he labeled the small cells as class B cells. He is now prepared to find the differences between them. Which cell might have more number of nuclei, class A or class B?
Answer: class A

Question: Bob just came from a hot air balloon ride. On his way home he saw two balloons, balloon A and balloon B. Balloon A was flat, but balloon B was inflated. He was wondering how balloons go up so effortlessly. Which balloon is more likely to take off, balloon A or balloon B?
Answer:
balloon B