Think of two ways on how you can apply prudence anf frugality on consuming each of the following?

Being prudence and frugality means being cautious, aware, and sensitive in the optimum utilization of natural resources. Although these resources are recyclable but still should be used in the limited and in need only.  

The two ways to apply prudence and frugality in consuming the resources are:

1.-  Responsible: The resources should be used in an optimum manner. It should be used at the need and limited extent.  

2.- Conscious: The resources utilized should be used in a conscious and concerned manner. We should practice the pattern of sustainability of the resources.  

The use of water should be as per the need and the limit.

In the digital transforming world, the use of paper should be very limited and should be avoided.

first, the romans stayed isolated because they had to defend their own territories from neighboring cities that were harassing them, like the etruscans. second, once the romans managed to defeat their neighbors, and started to expand their territory, they started to build roads and bridges. finally, now that the romans have covered their territory with roads functioning as highways, they could mobilize their legions faster to assemble larger military units in a specific place

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."