$(1)$ When is it appropriate to conduct a face$-$to$-$face meeting rather than communicating via email and vice versa?

$(2)$ In the Chapter $7$ section on composing emails, when e$-$mailing your professors, do you $($a$)$ include a subject line? $($b$)$ in $($c$)$ organize the body of the email for readability, clarity of content, $($d$)$ consider the audience? $($e$)$ consider your tone? $($f$)$ before sending it$?(g)$ close effectively?