Problem: Keith is a physician with the city hospital. He noticed that reactions inside human body happen in different rates. He specifically noticed two cases, case A and case B. In case A enzymes were present, but in case B enzymes were not present. In which case rate of chemical reactions would be lower, case A or case B?

A: case B

Problem: UK and France had scientific bases in Antarctica. UK had a base and studied the climate in East Antarctica, while France observed the climate in West Antarctica. Which country observed more weather fronts?

A: UK

Problem: Two friends met after 20 years. Tom had been smoking tobacco all these years and had some health problems related to that, while Randy quit smoking 25 years ago. Which friend had a lower risk of developing cancer of the lung?

A: Randy

Problem: Two teams of researches studied Antarctica's climate. The team studied two different regions. The US team studied East Antarctica, while the Swiss team studied West Antarctica. Which team didn't learn about a region that shows stronger warming in winter?

A:
US