The Wolves being reintroduced and the willow plant population recovering means that the wolves ate the primary consumers such as rats, sheep etc which led to a decrease in their population and plant consumption.
What are Producers?
These are referred to as organisms which produce food on their own through photosynthetic activities.
They are usually eaten by the primary consumers in an ecosystem. Wolves on the other hand are secondary or tertiary consumers which feed on flesh via the primary consumers. Introduction of wolves will therefore lead to a decrease in plant consumption thereby making them recover.
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