Both: \( 24 \)

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• Problem:** A science journalist reports that in a biodiversity survey, 81 plant species are found in wetland zones, 55 in forest zones, and 24 in both. Additionally, 12 species are present in only one zone (not both). How many total distinct plant species were recorded across all zones?
• Wetland only: \( 81 - 24 = 57 \)
• Forest only: \( 55 - 24 = 31 \)
• Species in only one zone: \( 57 + 31 = 88 \)
• But the problem states "12 species are present in only one zone (not both)", which is already consistent with separate counts.
• Total distinct species = wetland only + forest only + both:

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