Research on animals and language indicates that:
a. dolphins are able to express an infinite number of novel utterances through whistles and other sounds.
b. bonobos seem to be able to produce original sentences through a variety of grunts and screeches.
c. humans are the only species that evolved with the natural ability to express and comprehend an infinite number of novel utterances.
d. nonhuman animals don't have their own languages, but clearly demonstrate human-like abilities when taught to communicate.
Answer: c
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