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A river system is an example of _____________. A. a material cycle only B. a closed flow system C. an energy flow system only D. a matter and energy flow system
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A river system is an example of _____________. A. a material cycle only B. a closed flow system C. an energy flow system only D. a matter and energy flow system

User Riwels
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Answer:

A. a material cycle

Step-by-step explanation:

The material cycle is the cycle of materials on the Earth through living organisms and the environment.

User Ivan Pronin
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