Which method would increase the accuracy of counting fruit flies in an investigation?

Increasing the number of flies bred and counted enhances the accuracy of counting fruit flies because it provides a larger sample size. A larger sample helps to mitigate the effects of random variation and ensures that the data collected is more representative of the overall population. This can lead to more reliable statistical analysis, as it reduces the potential for anomalies that may arise from a small or limited sample size.

With more individuals observed, researchers can better account for the natural variability in the population, leading to more accurate conclusions regarding the characteristics being investigated. A well-rounded sample size is crucial in scientific research, particularly in studies involving biological specimens, where the inherent variability can significantly impact findings.