Trade barriers in a sentence do not copy in paste

the use of electrical signals that transit messages is know as

dude the first thing it says is that copied answers will get a zero. plus it would take anyone on an incredibly long time to answer. ive seen 2 people asking the exact same question and their questions got taken down. i have the assignment too, and im in the progress of doing it. i suggest going to a more private website, because this is the first place teachers look.

answer; revisionist;

answer; martin seligman;