It is a short story/ the second choice
Ethics serve as a guide to moral daily living and helps us judge whether our behavior can be justified. Ethics refers to society's sense of the right way of living our daily lives. It does this by establishing rules, principles, and values on which we can base our conduct.
Answer:
The first one is correct.
Explanation:
Hope this helps u out.
Is - two billion dollars is a unit, one unit so it is singular and you use the singular verb
think - scientists is a plural, therefore, you must use the plural verb form of think
