Answer the following question: Fact 1: An animal requires air for survival. Fact 2: Long term survival depends upon outside air to breathe. Given the two facts above, animal long term survival requires what?

Available choices:
(I) hibernation;
(II) breathing;
(III) Glucose;
(IV) planting;
(V) four limbs;
(VI) sleep;
(VII) jousting;
(VIII) crowing;
Answer:
(II)