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February 22, 2026

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Lena sequences DNA from two extremophile strains. Strain A has 4.2 million base pairs, and Strain B has 30% more. What is the total number of base pairs in both strains?
Strain B = 4.2 million × 1.30 = <<4.2*1.3=5.46>>5.46 million
Total = 4.2 + 5.46 = <<4.2+5.46=9.66>>9.66 million base pairs
A research drone descends in stages into a vent at 3,600 meters. It goes down 1/4 of the depth, then 2/5 of the remaining, then 1/3 of what’s left. How many meters has it descended after all three stages?
First: 1/4 × 3600 = <<3600/4=900>>900 m → remaining: 2700 m
Second: 2/5 × 2700 = <<2/5*2700=1080>>1080 m → remaining: 1620 m

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