Tierra con agua heterogenea o ​

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.

polar areas, such as antarctica or the south pole.

what events in mexico's history might explain why the country continues to have difficulty improving social justice and economic opportunities for all people?