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    Chimpanzees lack recursion, displacement, and other core ... — Carmelics
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    Supports→If UG were a product of natural selection, we would expect clear homologs in closely related primates, yet no such faculty has been identified in chimpanzees.

    Chimpanzees lack recursion, displacement, and other core UG properties despite 6 million years of separate evolution, suggesting UG isn't a refinement of ancestral primate communication.

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    Key Terms

    Ancestral primate communication(as used in evolutionary biology and linguistics)
    The ways that our evolutionary ancestors (earlier primates) communicated with each other, assumed to be simpler than human language.
    Core UG properties(as used in linguistics)
    The fundamental features or rules that are thought to be part of Universal Grammar—the basic building blocks common to all human languages.
    UG (Universal Grammar)(as used in linguistics and philosophy of language)
    A theory that all humans are born with an innate mental system that helps us learn language, rather than learning grammar completely from scratch from our environment.
    displacement(Illustrated by the relation between (18D) and (18S))
    A syntactic operation in which an element (such as 'John') is moved from its original position to fulfill the subject requirement

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    recursion(HCF's characterization of the core property of FLN)
    A cognitive universal capacity posited by HCF that underlies not only natural language but also arithmetic (counting and the successor function), and possibly navigation and social relations; not defined over specifically linguistic inputs and outputs.

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