change of the population in a country can be understood and explained by looking at the of population​

change of the population in a country can be understood and explained by looking at the ___percentage of population

Explanation:

d. new methods of assembly are introduced.

explanation:

this allows for the goods to be made on a larger scale. not faster because now it is shown to be made better, hence the greater productivity in the question. it is calling for something new to be introduced.

the answer is blue river