Which characteristics did early Japanese, Chinese, and Korean civilizations share? They were friendly nations that shared culture and customs.
They were nations at war that shared a common religion.
They were neighboring countries that shared a common history.
They were countries with dissimilar culture and customs.

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.

answer; depression and breathing related sleep disorder(independent);

answer; mission;

answer; clelia mosher;