What are the basic reasons why nations trade with each other?

Which best describes the purpose of the south carolina exposition and protest, which was written by john c. calhoun? a) to explain why the south was nullifying the tariff of 1828 b) to describe the ways the tariff of 1828 would southerners c) to persuade northern states to rebel against the federal government d) to ask england for if the south decided to secede from the union

The following force measurements were taken during actual testing of the lever pictured. what is the ama of this lever?

What is the cause of their extinction