One key factor in Gallup's study that seems to be necessary for a chimp to demonstrate self-awareness in his experiment is

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The study found that prior experience with mirrors, specifically exposure at a young age, was a key factor in a chimp's ability to demonstrate self-awareness in the mirror test. The other options (intelligence, being raised by humans, and having seen an adult chimp go through the procedure) were not identified as necessary factors in the study.

One Key Factor in Gallup's Study That Seems to Be