What represents a characteristic of an ecosystem that is not likely to sustain itself?

A characteristic of an ecosystem that is not likely to sustain itself is low biodiversity. Ecosystems with limited species diversity are more vulnerable to disturbances, such as disease or climate change, as they lack the resilience provided by a variety of organisms. Additionally, such ecosystems may struggle to provide essential services, like nutrient cycling and pollination, which can further compromise their stability and longevity.