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Read the text carefully and choose the option that best captures its essence: The distinctive holes, or 'eyes,' in Swiss cheese are not merely a visual quirk but a fascinating byproduct of a precise microbial process. For centuries, cheesemakers believed these characteristic voids were caused by carbon dioxide released by bacteria like Propionibacterium freudenreichii during fermentation. However, recent scientific findings have refined this understanding. It turns out that tiny hay particles, often present in the milk used for cheesemaking, play a crucial role. These microscopic bits of hay act as nucleation sites, providing the perfect microscopic pockets where gases, produced by the bacteria, can accumulate and expand, thus forming the iconic holes. Without these minute solid particles, the gas would escape more evenly, resulting in a cheese with a denser, less 'holey' texture. This discovery highlights the intricate interplay between traditional farming practices and microbial activity in creating a beloved culinary staple.