3. What are vaccines? How do they help our bodies and how do they affect viruses?

it's a type of medicine for humans so that we won't catch any diseases or get sick.

it also supports my hypothesis. if you rest first you can squeeze the clothespin more times. from the data i collected the average of the eight people concluded exercise makes your muscles more fatigued and less able to squeeze the clothespin compared to resting before squeezing.