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About Evolution & Natural Selection

Pollution caused moths to become darker, improving camouflage and survival over generations.

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Biological MoleculesCell Structure & FunctionCellular Respiration & EnergyPhotosynthesisDNA & RNA
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Evolution & Natural Selection HESI A2 Practice Questions

Free Evolution & Natural Selection practice questions for the HESI A2 exam with detailed rationales.

Question 1 of 2

Which of the following is an example of natural selection?
A dog breeder selects for specific coat colors.
A population of moths becomes darker over time due to pollution.
A farmer selectively breeds cows for higher milk production.
A scientist modifies a gene in a plant to make it resistant to pests.