Some benefits of using on farms instead of human labor are that work can be done much more quickly and the cost of production usually is decreased. A. GDP B. technology C. a standard of living D. economic sectors

Technology instead of human labor because it was faster.

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productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.