Ecosystems mostly consist of both - abiotic and biotic factors. For that reason the answer which would properly address your question would be A - biotic and abiotic factors. Biotic factors are considered to represent the part of nature that are living and affect other organisms while abiotic factors are things which do not affect other living compounds.
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frogs. the lower the ph the higher the acid content. frogs have the highest tolerance in this scenario.
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the answer is :
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