The correct answer is:
a.
Run on
The given sentence is
an example of a run on sentence which is also known as a “fused sentence”. It has
two parts wherein either part can stand alone without the other. But instead of
being connected properly, they have been pieced together inaccurately and could
still be improved.
This is not an independent clause: it is dependent on the main phrase here, which is "<span>Most of these animals stay under water".
The underlined clause tells us something about why they must stay under water; and sentences that tell us about the why are called the "adverb clauses" - the correct answer.
</span>
It is about the twelve months of the year
Paul Revere’s fame as a hero of the American Revolution has been passed down from generation to generation through Henry Wadsworth Longfellow’s poem, “Paul Revere’s Ride.” Revere’s midnight ride before the 1775 Battles of Lexington and Concord warned American soldiers that the British were coming to attack them. But what was his life like before and after that glorious event? James Cross Giblin tells Revere’s story from birth to death in this richly illustrated narrative.
Really hope this helped!!!