Research on the brain sizes of various animals has indicated that brain size is MOST strongly linked to a species' ____.

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Research has consistently shown that species with more complex social structures tend to have larger brains relative to their body size. This is because navigating social relationships requires skilled cognitive abilities. Empathy and emotional intelligence are also related to brain size, but to a lesser extent. Lifespan is not a strong predictor of brain size.

Research on the Brain Sizes of Various Animals Has Indicated