Despite the best efforts of researchers, nonhuman primates have never been able to demonstrate productivity when using sign language.

Name: Despite the best efforts of researchers, nonhuman primates have never been able to demonstrate productivity when using sign language.
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Question

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Nonhuman primates, such as Koko the gorilla, have demonstrated the ability to use sign language productively, combining signs in novel ways to express thoughts or desires.

Despite the Best Efforts of Researchers, Nonhuman Primates Have Never