Since the 1970’s and ever increasing since, since the majority of professional researchers and historians believe that humans first emerged in blank over 2000,000 years ago

East Africa

Explanation:

Since the 1970s, evidence points out at the fact that humans (home sapiens) first emerged in East Africa around 200,000 years ago, more specifically in the areas that surround the great rift valley, which runs along Ethiopia, Kenya and Tanzania.

a. competition with other nations.

following type of cultural development caused people to want and buy new products on the market :