According to your text, what factor do biologists emphasize as the MOST important to natural selection?

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Biologists consider reproduction as the most important factor in natural selection as it determines the passing on of traits to the next generation. The individuals who are better adapted to their environment and able to reproduce successfully are more likely to pass on their advantageous traits to their offspring, leading to the evolution of a species over time.

According to Your Text, What Factor Do Biologists Emphasize as the MOST