8. If the teeth span increased from 6.8 cm to 12.9 cm in 30 million years, what was the average increase in to?
8. If the teeth span increased from 6.8 cm to 12.9 cm in 30 million years, what was the average increase in tooth span per million years?
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Step one: Subtract 12.9 cm - 6.8 cm = 6.1 cm.
Step two: Per means divide. Therefore divide 6.1 cm ÷ 30 = .203 (rounded) cm per million years.
The answer is .203 cm per million years.