What is the difference between a letter and a mail?.

A letter can be mail. A large package can also be mail. A letter or a package usually both come in the mail. The mail man/woman usually puts both into your mailbox unless the package won't fit. Then they either bring it to your door or leave a paper in your mailbox telling you to come pick up the package at your Post Office

the verbs are different

Explanation:

d the united states

explanation: the united states is the only major industrialized country in the world that does not use the celsius scale and the metric system as its predominant system of measurement, according to a report released by the national institute of standards and technology