Answer:
-Authority: Who is the author? what is his/her credentials--what university he/she is affliliated? ...
-Usefulness: How this source related to your topic? How current or relevant it is to your topic?
-Reliability: Does the information comes from a reliable, trusted source such as an academic journal?
Certainty means a firm conviction that something is the case.
Answer:
What is the author’s main purpose in the text?
A
to argue that humans are capable of acting unselfishly altruistic towards others
B
to prove that people can be altruistic for a rewarding feeling, without being selfish
C
to explore the origins of altruism and how “pure” altruism has developed over time
D
to show how altruism is actually an essential part of human survival
Explanation:
Telling a friend that someone that you know is talking bad about them
I did this assessment The answer is the first one I believe .