I'm not exactly sure, but I think this statement is true, although the antagonist can sometimes be a rival to the protagonist without knowing. It really depends.
The correct answer for the question that is being presented above is this one: "Looking through the boat's glass bottom, we saw brightly colored fish and even a small shark swim past us." The sentence that has a mismatch between subject and modifier is this "<span>Looking through the boat's glass bottom, we saw brightly colored fish and even a small shark swim past us."</span>
He is a strong, selfless person
that is son of poseidon. He faced
many obstacles and did it to save
others regardless the task.
I believe it's this line - <span>They were mostly fisher-folk who patronised Mr. Jellyband's coffee-room, but fishermen are known to be very thirsty people; the salt which they breathe in, when they are on the sea, accounts for their parched throats when on shore, but "The Fisherman's Rest" was something more than a rendezvous for these humble folk.
</span>An essential element of historical fiction<span> is that it is set in the past and pays attention to the manners, social conditions of that period.</span>