Which geographic features contribute to cultural diffusion?

Natural barriers such as mountain ranges, oceans and large deserts limit human travel and isolate populations, thus restricting cultural exchanges. Island nations, such as Japan, were long isolated from other cultures. This fostered the development of rich, unique cultures.

Explanation:

hope that helps if not arry

answer; (d) none of the above;

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.