Multiple choice

  The evolutionary fitness of an individual is measured most directly by

  1. the length of its lifespan

  2. the number of mates it attracts

  3. the number of beneficial genes it has

  4. the number of its offspring that survive to reproduce

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In evolutionary biology, fitness is defined by an organism's ability to survive and reproduce. Therefore, the most direct measure is the number of offspring that reach reproductive age and pass on their genes.

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