Individual "A" produces 10 offspring,8 of whom survive to adulthood.Individual "B" (a member of the same population)produces 15 offspring,7 which survive to adulthood.Based on the concept of natural selection,individual "A" has the higher fitness.

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Fitness in evolutionary terms is measured by the number of surviving offspring that reach reproductive age. Individual "A" has 8 surviving offspring, while Individual "B" has 7, indicating that "A" has higher fitness.

Individual "A" Produces 10 Offspring,8 of Whom Survive to Adulthood