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One of the most important factors for the evoluction of human being has been the language.
Also knowledge about different subjects such science, art, and technology has advanced in en benefit of society,

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We learned to speak as a primary function and written secondly. The way in which human being communicates with others is different from animal communication.

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Language is a dynamic system with a dialect and sociolect, and idiolect.
Phonological level is  relates differences in sounds and differences meanings.
Lexical level include morphemes or whole words.
Syntactic level form the sentences.
Social level includes age, gender and social class.

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Dialect is used in a particular group of people in a especific place around the world.
1. Language is Arbitrary: Language has specific words to named its elements .
2. Language is social: Because form parte of a group, community,  and permit social interaction.
3. Language is symbolic: Language is made by signs.
4. Language is systematic: Language follow rules in order to make a structure.

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Language is a composed of vocal-sound. Only produced by physicological articulatory mechanism.

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Language is Non- instictive conventional: Language change generation to generation.

Language is Productive and Creative: It changes according to the needs of tha society.