Difference = 350 – 588 = –238 → negative, so fewer. But the question asks how many more — if fewer, answer is negative? But likely misinterpretation.
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- Wait — correction: 7:5 → total parts = 12 → B = 5/12 ≈ 41.7%. Pre-industrial was 7:7 → 70%. So B decreased, but let's proceed numerically.
- Pre-industrial B: (7/10)×840 = <<7/10*840=588>>588
- Modern B: (5/12)×840 = (840 ÷ 4)×(5/3) = 210×(5/3) = <<210*5/3=350>>350
- Wait — perhaps the ratio reverses? 3:7 → A:B = 3:7 → B = 7/10 = 70%
- Modern: 7:5 → if A:B = 7:5, then B = 5/12 ≈ 41.7% — still less. But maybe typo?
- Alternatively, perhaps the counts shift: but the ratio change suggests relative increase. Let's assume the fossil count is 840 with modern ratio 7:5 → total parts 12 → B = (5/12)×840 = 350
