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Which of the following is mentioned in the passage concerning the natural ecosystem?
The passage states that economic systems are embedded (=inserted) in the natural ecosystem, but not that they share the same underlying principles.
The passage does not mention the health of the natural ecosystem.
While the fourth sentence of the second paragraph says that farmers make use of the eco-system, nothing is stated about farmers sustaining the economy.
The passage does state that externalities impact the environment, but nowhere compares the toll on the natural ecosystem to the other negative impacts of externalities.
The passage explicitly states that the natural ecosystem sustains (=keeps in existence) economic systems.