Problem: Bill and Bob were two brothers. they were both into physical exercise, but Bill chose weight lifting, and Bob running. Which brother had fewer muscles contract against a resisting force?

A: Bob

Problem: Anthony is cleaning his apartment using abrasive chemicals to make sure everything is clean. It is currently winter so his house is sealed up tight to keep it warm. Given that Anthony decides to open his windows after cleaning to let fresh air in, will the amount of air pollution in his apartment increase or decrease?

A: decrease

Problem: Two medical students had to study about viruses that cause cancers in humans. Brady studied about hepatitis viruses, while Dean studied about human papillomaviruses and Herpesviridae. Which student read more about cancers of the skin?

A: Dean

Problem: Two islands were located in the Pacific Ocean. Woo island was frequently shaken by earthquakes, but Mud island had no such problems. Which island experienced fewer rocks breaking because of stress?

A:
Mud