The answer is B. As that is what enzymes do to catalyze reaction.
It is symbiosis, but also called a commensalism relationship because the remora is getting its food and the shark has no benefit.
I'm not sure what the options are for an answer but based on what I remember from my ENTO class, it would be secondary myiasis.
False because the third line of defense is specific by identifying the foreign antigen and activating the antibodies that can bind to the invaders and eliminating the spread