Guadalupe Romero Villanueva et al. conducted radiocarbon analysis of paint used in rock art at the Patagonian archaeological site Cueva Huenul I, revealing that images of a comblike motif date to as early as 8,000 years ago, predating other paintings in the region by several millennia. The motif was subsequently reproduced multiple times at the site over the next 3,000 years, a period coinciding with extremely arid conditions and slightly negative population growth .The motif may therefore have functioned to help preserve cultural knowledge during a time of ecological and demographic stress.
Which choice best describes the function of the underlined portion in the text as a whole?
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