Answer: that means that it has undergone the peer review process. Peer review is a process (not a type of article) in which an article is judged by an impartial panel of two or more experts in the field; these experts are called "peer reviewers.
Explanation:
Answer: When a friend or anybody gives you feedback on your writing!
Explanation: A peer review is basically when your friend or any other person you know gives critisism on your writing!
