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(C) An ecosystem is a functional unit of nature where living organisms interact among themselves and with the surrounding physical environment. The fu

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Both of the above

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(C) An ecosystem is a functional unit of nature where living organisms interact among themselves and with the surrounding physical environment. The functional aspects of an ecosystem are primarily characterized by: $1$. Productivity (rate of biomass production). $2$. Decomposition (breakdown of organic matter). $3$. Energy flow (unidirectional movement of energy through trophic levels). $4$. Nutrient cycling (biogeochemical cycles where nutrients move between biotic and abiotic components). Therefore,both energy flow and nutrient cycling are fundamental functions of an ecosystem.

The importance of an ecosystem lies in its function of:

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