The answer is It tells the reader what will be discussed.
Yes, you should put a comma.
A comma is usually used in the middle of a sentence to separate two clauses, or right before a conjunction. Since “like” is a dependent clause in this sentence, as “it can be attractive” can stand alone, a comma would be put before it. It may also help to read the sentence and see if there is a natural pause to it.
It's an indicator that <span>he and Daisy are not a happily married couple.
</span>the telephone in this situation represents Tom's live outside the one With Daisy (Tom constantly cheat on Daisy in their relationship)
Daisy had a tell of the situation but never really do anything about it and everytime the phone rang, Daisy know that Tom can't wait to get away from her
<span>Convenience sampling can produce biased research results. TRUE.</span>
