1. What is language?
-Language is creative system of human-communication which is arbitrary itself at lexical level but not at the syntactic level. In brief, language is a tool for human’s communication.
2. Do animals have their language?
-No, they haven’t their language. Animals can’t use arbitrary vocal symbols. Even they have their communication but it’s not a language, because their communication is too instinctive and there isn't creativity on it.
3. What are the characteristics of language?
-The characteristics of language are vocal symbol system’s arbitrariness, creativity, and non-instinct. languages are cultural too.