Final answer:
Primatologists Dorothy Cheney and Robert Seyfarth discovered various aspects of vervet monkey vocalizations but did not study or discover anything relating to food sharing in these monkeys.
Step-by-step explanation:
The thing not discovered by primatologists Dorothy Cheney and Robert Seyfarth during their study of vervet monkey vocalizations is D) Food sharing. While their study did focus on understanding the complexity of primate communication, including the use of various calls for different purposes such as alarms, predator communication, and possibly mating rituals, there's no recorded evidence that they discovered communication in relation to food sharing.
In their research, Cheney and Seyfarth found that vervet monkeys have different alarm calls depending on the type of predator detected - a clear demonstration of their complex vocal communication. Like other primates and animals, vervet monkeys have been observed using touch and other forms of non-vocal communication, but this does not necessarily relate to food sharing. It's important to understand that while primate communication shows some similarities with human language, it lacks certain characteristics such as the open-ended ability to recombine signs and symbols.
Learn more about Primate Communication