Which would best explain how tobais contracted mononucleosis

Tobias drank from a water fountain that was contaminated.

Explanation:

Infectious mononucleosis is a disease caused by a virus and is also known as kiss disease. The virus that causes the disease is transmitted through saliva, so it is most often transmitted by kissing, but it can also be transmitted by sneezing, coughing, using the same cup or cutlery with an infected person.

b tumor cells have a cell wall instead of a membrane

explanation:

tumor cells different from normal cells because tumor cells have a cell wall instead of a membrane.

answer; civil inattention;