Vestigial usually refers to traits which over evolution have lost their main function and are less useful than they once were.
In number one Hunter means that he thinks the teeth were from the ancestor whale shark but are now useless or nearly useless to the current whale shark.
I do not have fun when I am sent on errands. Errands are busy-work and I am already an extremely busy person! When I go on an errand, I get in there and I get it done. I try to complete my objective as fast as possible.
I believe the answer is c. adjective phrase, hope this helps!
I can never get home in time on mondays to watch football
