Inference from Urban Wildlife Study

During a recent study focusing on urban wildlife, researchers observed that cities with a high number of green spaces had a greater diversity of bird species than those with fewer green spaces. Subsequently, they also found that in cities that prioritized green space development, not only did the number of bird species increase, but the populations of insects, which are critical food sources for these birds, also thrived. The researchers concluded that creating more green spaces in urban areas directly enhances both avian and insect biodiversity.

Based on this study, which of the following statements must be true?