Physics · Ecosystem Dynamics

Consider the following statements regarding ecosystems: A. An ecosystem necessarily requires biotic, abiotic and energy components. B. The biosphere is considered a closed ecosystem because materials can enter and leave freely. C. Energy input to the biosphere is primarily unidirectional. D. Nutrient cycles in the biosphere generally involve repeated recycling. Which of the above statements are correct?

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Correct answer

A, C and D only

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