Lister discovered the relationship between cleanliness and infection rate. Hope this helps.
Well is not for sure, maybe only you can get sick but the other person cant. so I would say is not for sure. . well it all depends on ur stomach. hope this has helped.
Answer:
B. The frequency would increase because individuals with the gene for more molecules would leave more offsprings .
TY!!!!:D IM GLAD I GOT THIS I NEED IT