Stretch marks are a common occurrence, affecting up to 80% of people, and an evolutionary biologist explains their formation. These marks are a result of the skin's connective tissue stretching beyond its elastic capacity, often due to rapid growth or weight changes. The biologist notes that evolution has not eliminated stretch marks because they do not pose a significant survival disadvantage, and they should not be a source of shame. AI
RANK_REASON The item is an explanation from an expert on a biological phenomenon, fitting the commentary bucket.
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