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Natural Selection and Adaptation
Worksheet
Grade Level
Grade 6
6.97 Natural Selection and Adaptation
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Which model best represents natural selection in a polluted river where some insect larvae carry an enzyme that helps them survive toxins?
A
A model showing variation in enzyme trait, toxin exposure killing more larvae without the enzyme, and survivors producing more offspring with the enzyme trait
B
A model showing no larvae surviving but the enzyme trait still becoming common
C
A model showing every larva growing the enzyme only after touching the toxin once
D
A model showing larvae choosing whether to have the enzyme before hatching
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