Question

Use the following passage to answer the question.

Answer 1

Sentence 12 needs to be changed.
:)

Answer 2

The sentence which needs a semicolon to be correct is (5) Water is not everywhere it's miles away.
As you can see here, this is a run-on sentence, meaning that these two sentences are just placed into one big sentence without connecting them in any way - the sentence is lacking appropriate punctuation marks, which in this case, is a semicolon.
Water is not everywhere; it's miles away.