A good way to measure the quality of life in countries across the world is by comparing their: * 1 point

per capita income

HDI

GNI

Sustainable development​

answer; by working independently, the states have a high likelihood of developing innovative solutions that can be employed in other states;

c. taught scientists many new things about the earth, but not other planets.

explanation:

industry had made the u.s. the richest nation in the world at this time. the second industrial revolution caused growth in industry and transportation, which allowed increased trade between nations.

i r r e l e v a n t