Final answer:
Fitness in biology involves measuring reproductive success by an organism's contribution to the gene pool.
Explanation:
Fitness in biology refers to the measure of an organism's reproductive success, indicating the ability to survive and produce offspring. It is not about individual performance but about how well an organism's genes contribute to the next generation.
Scientists evaluate fitness by examining the relative contribution an individual makes to the gene pool compared to others in the population. This concept aids researchers in understanding evolutionary processes and population dynamics.
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