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Darwin's three principles behind natural selection: traits are inherited, more offspring are produced than survive, and:

AOffspring vary
BSpecies are fixed
CTraits are acquired
DHabitats never change
Answer & Solution
Correct answer: A. Offspring vary
1. Variations among offspring are inherited. 2. Offspring vary in their characteristics. 3. Better competitors leave more offspring. _Source: OpenStax Biology 2e, Chapter 18, Evolution and the Origin of Species (CC BY 4.0)._
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