Question 1 is Athlete's Foot
Question 2 is a virus
Maritime transportation became less important to developed countries
in the 1950s, planes became a more popular mode of transportation, so traveling by sea was not as popular to developed countries
Setting good examples, keeping everything in order, making sure every thing stays in line, and provide work for the teachers to teach the students
I'd say everything can be used but only what is needed for particular patient.