evolutionary  - involving a gradual process of change and development:, primates - the most developed and intelligent group of mammals, including humans, monkeys, and apes, undergo - to experience something that is unpleasant or something that involves a change, complex - involving a lot of different but related parts, usually difficult to understand , mutate - to develop new physical characteristics because of a permanent change in the genes. These changes can happen naturally or can be produced by the use of chemicals or radiation:, convey - to express a thought, feeling, or idea so that it is understood by other people, relate - to find or show the connection between two or more things, to be able to understand a situation or someone's feelings because you have experienced something similar yourself, civilization - human society with its well developed social organizations, or the culture and way of life of a society or country at a particular period in time, trace - to discover the causes or origins of something by examining the way in which it has developed/a sign that something has happened or existed, remain - pieces or parts of something that continue to exist when most of it has been used, destroyed, or taken away/ to stay in the same place or in the same condition:, existence - the state of being real, or of being known or recognized, innate - An innate quality or ability is one that you were born with, not one you have learned, capacity  - someone's ability to do a particular thing, protolanguage  - a hypothetical undocumented parent language from which actual languages are derived.,

How humans evolved language

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