If you are talking form a grammatical point, the subject of "the warm inventor" would be the word "inventor".
B. The quotations are for the song so the question mark goes on the outside.
The sentence, 'When my family went on vacation, we were able to see many new places' is a complex sentence.
<u>Explanation:</u>
The above mentioned sentence is structured in a complex way. Complex sentences are the ones which contains one independent clause and one dependent clause. When my family went on vacation, we were able to see many new places, here we can see that it contains a dependent clause 'When my family went on vacation' and one independent clause 'we were able to see many new places' making it a complex sentence. Both the clauses are being separated with a comma.
Though Humans live there lives unaware, they do know that they will not live forever
