Which is biotic, i. decomposers ii. energy flow iii. producers

It would be III. Producers. They're living things and produce. Hope I helped.

The answer would be Decomposers and Producers because both of them are living. Biotic factors are living organisms that shape ecosystem. Decomposers break down dead organisms which shapes an ecosystem and producers convert energy into food. 

So, your answers are I and III. 

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