Final answer:
Dominance hierarchy is the most important predictor of stress levels in baboons.
Step-by-step explanation:
The most important predictor of stress levels in baboons is Dominance hierarchy. Neuroscientists Robert Sapolsky and Carol Shively have conducted extensive research on stress in non-human primates and have shown that an individual's position in the social hierarchy predicts stress levels, mental health status, and disease. This research suggests that stress may lead to negative health outcomes for baboons who are stigmatized or ostracized within their social group.