Answer:
The correct answer should be: "[...] only human language utilizes complex system of speech".
Explanation:
Although animals such as dolphins and great apes communicate, which is a form of language, only humans are capable of producing speech through the use of words and a complex set of phrases and sentences. Animals do not speak, even though they communicate differently, only people are able to use language in this way, only humans use a complex system of language data inside out their minds while using oral or written speech.
Three They are all pretty un-important to the rest of the story. Why didn't you just google this?
This means that sometimes what actually happened historically will be warped to make one side seem more righteous.