Geography
WAEC 1990
Which of the following combinations can be regarded as sub-systems within the ecosystem?
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A.
food chain, hydrological cycle, mineral nutrient cycle
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B.
hydrogical cycle, mineral nutrient cycle, evironmental controls
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C.
Mineral nutrient cycle, hygrological cycle, ecosystem controls
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D.
Ecosystem controls, food chain, hydrological cycle
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E.
Food chain, ecosystem controls, environmental controls
Correct Answer: Option A
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