The answer would be true the phrase alone can be a sentence
Answer: they all wear silk pajamas on Wednesdays
Explanation:
Band tradition since 9/11
It would be a subordinate cause, for it can't stand on its own. Think about it: Since early this morning. What happened since early morning? Since it doesn't provide that information, it wouldn't be able to be an independent cause.
Also, I don't believe that the sentence is grammatically correct :)
A young boy and his furry German Shepard dog quietly sat by a giant,beautiful house.