Final answer:
An unhealthy ecosystem can be indicated by decreasing biodiversity.
Step-by-step explanation:
An unhealthy ecosystem can be indicated by decreasing biodiversity. Biodiversity refers to the variety of different species in an ecosystem, and a decrease in biodiversity can be a sign of environmental degradation or disruption. For example, habitat destruction, pollution, and climate change can all lead to the loss of species and a decline in biodiversity.
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