The Tigris and Euphrates Riverswere so important to the survival of people. Why were they so important for the development of a civilization?

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.

the correct answer is d

yes peace and development are complementary to each other since they both undergo a great deal of getting where they want to go whether its peace in general and. development

answer; the above statement is (true);