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B
Mineral cycling and energy flow
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C
Food chain and energy flow
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D
Energy flow and decomposers
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Solution
The correct option is A Food chain and decomposers An ecosystem includes different communities of plants, animals and microbes together with their physicochemical environments. It consists of two major components, biotic or living components and nonbiotic or nonliving components. Biotic components include plants, animals, decomposers. Nonliving components include air, water, land. A food chain is a chain in an ecosystem where there is transfer of food and energy from one organism to another in a sequence.
Thus, the correct answer is 'Food chain and decomposers.'