Final answer:
An ecologically sustainable population maintains a positive growth rate and produces a surplus of individuals that disperse to other local populations. This allows for genetic diversity and adaptation.
Step-by-step explanation:
An ecologically sustainable population maintains a positive growth rate and produces a surplus of individuals that disperse to other local populations. This phenomenon is known as population dispersal and it ensures the continued growth and survival of the species. It is important for maintaining genetic diversity and enabling adaptation to new environments.