A) Producers and light
B) Producers and decomposers
C) Producers and consumers
D) Producers, consumers and decomposers
Correct Answer: C
Solution :[c] Ecosystem should always maintain a balance. If primary consumers in an ecosystem are absent, then producers will be increased in number and will create overcrowding. It results in competition and consequently number of producers once again decrease to near normal. Thus each ecosystem maintains biological equilibrium in nature with the help of producers and consumers.
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