Language is a system of communication consisting of sounds, words, and grammar. This definition emphasizes three features:
1. Language consists of sounds organized into words according to some sort of grammar.
2. Language is used to communicate.
3. Language is systematic.
We can address this question in two ways: (i) evolutionary (our biological heritage) and (ii) historical (how languages have changed through time).
Our ability to produce sounds with meaning suggests two biological abilities:
Most animals can’t talk because they don’t have a larynx. But, they do use sound gestures, and bodily movements to communicate.
1. Animal call systems are limited in what and how much they can communicate.
2. Call systems are stimuli-dependent, which means an animal can communicate only in response to a real-world stimulus.
3. Among animals each call is distinct, and these calls are never combined to produce a call with a different meaning.
4. Animal call systems tend to be nearly the same within a species, with only minor differences between call systems used in widely separated regions.
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