Which of these valuable items was a trade good during the Shang dynasty? silk
steel
O ivory
O ironwork

answer; /// i believe that the correct answer is(cognitive revolution);

dont understand question can you makeit more better

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.