You are presented with the quiz "What does a warm body temperature do?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "an animal usually requires a warm body temperature for survival" and "survival means survival of the species". So, what's the best answer to the question?

OPT: [i] helps a species to thrive. [ii] cools down the body. [iii] make a species endangered. [iv] Increase user's heart rate. [v] heat the body. [vi] causes a species to go extinct. [vii] depress neuronal excitability. [viii] heat is produced.
The answer is:
[i]