A) Frogs and men
B) biotic and abiotic
C) Plants and animals
D) weeds and trees
Correct Answer: B
Solution :[b] An ecosystem is a self-sustaining, energy driven and interacting system of living organisms and their non-living environment. It has two components, the first being biotic components which comprise kinds, numbers and distribution of living organisms and abiotic components consists of kinds, quantity and distribution of physical and chemical factors.
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