Answer the following question: Fact 1: Sound can be used for communication by animals. Fact 2: Many animals rely on sounds to communicate to others in their species. Given the two facts above, what do species rely on to talk?

Possible answers: (I) Frogs; (II) energy; (III) language; (IV) hands; (V) squids; (VI) feet; (VII) Frogs.; (VIII) sound;
Answer:
(VIII)