Which of the following observations is the best example of evolution at work?

Question

BlackTom AI · Accepted Answer

Evolution is defined as a change in the distribution of traits in a population from one generation to the next (i.e., change in allele frequencies or trait prevalence across generations). Key requirements for evolutionary change are (a) variation in the trait, (b) heritability (traits passed across generations, genetically or culturally), and (c) differential transmission that changes population-level frequencies over time.

1) Relevant knowledge points and concepts
- Evolution = change in trait distribution across generations (genetic or cultural evolution).
- Heritability distinguishes mere individual differences from changes that persist between generations.
- Population-level change (not just within-family resemblance or single-person success) is central to demonstrating evolution.

2) Step-by-step reasoning
- Option 1 explicitly compares generations and claims a shift in cognitive ability (more people can think abstractly now than before). That describes a population-level change across generations.
- Option 2 asserts “the weak have died off so we are stronger,” which is a vague, unsupported claim about selection and conflates mortality with positive evolutionary change.
- Option 3 notes parent–child similarity in personality, which demonstrates heritability or familial resemblance but not a generational change in the population.
- Option 4 describes one individual’s reproductive success and interprets it as “adaptation,” which is an individual outcome, not evidence of population-level evolutionary change.

3) Calculations/intermediate steps
- No numerical calculations are required; logical inference about population vs. individual/family-level phenomena suffices.

4) Why the correct answer is correct
- Option 1 names a difference between generations; that is the hallmark of evolution. Whether the cause is genetic selection or environmental/cultural factors (e.g., improved education, the Flynn effect), it still describes a trait frequency shift across generations and thus qualifies as evolution (biological or cultural).

5) Why the other options are incorrect
- Option 2: Vague and teleological; lacks evidence of differential reproductive success leading to heritable improvement.
- Option 3: Shows heritability/familial resemblance but not change across generations (no population-level shift).
- Option 4: Individual reproductive success does not by itself demonstrate evolutionary change in the population.

6) Conclusion
The best example of evolution at work among the choices is: "When we compare across generations, more people can think well abstractly now than in previous generations." This matches the provided correct answer.

Which of the following observations is the best example of evolution at work?Single choice

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