The advantage of diverse phenotypes in a species primarily lies in the increased likelihood of survival and adaptability to changing environments. Specifically, the statement "The species is more likely to survive changes in the environment" highlights this advantage.
Diversity within a species means that individuals possess a range of traits, which can lead to a variety of responses to environmental challenges, such as changes in climate, food availability, or the presence of predators. Some individuals may have traits that allow them to thrive under new conditions, while others may not. This variation can lead to greater overall resilience of the population.
Additionally, while diverse phenotypes can facilitate the increase of favorable allele frequencies over time through natural selection, the immediate advantage relates to the species' overall adaptability and survival in the face of environmental changes.