Study the two maps. Then, use the drop-down menus to answer the questions. What part of ancient and modern China has a high population density?

How has the population of the Yangtze River valley changed over time?

What area is least populated, both in the present and in the past?

Yellow River, also called Huang He, principal river of northern China, ... it is the country's second longest river—surpassed only by the Yangtze River ... The Yellow River basin has an enormous population—exceeded by only a ... of landscape evolution and ancient environmental change in the region.

I hope this helps also please mark BRAINLIEST

For the first drop down menu it's, the North China Plain. For the second drop down menu it's, It has increased. For the third drop down menu it's, western China.

Explanation:

on my assignment I had duplicates of the answer if you have the same problem just pick the other one if it says it's incorrect.

                                                      hope it helps

answer:

d. because dr. laguardia selected a widely used measure, his study generalizes to has strong external validity. external validity has limited external validity. other applications of this measure.

the widely used measure that he applied to his experiment was the benton facial recognition test. it employed on to football players and as result, only players who suffered brain concussions did not pas this test. and although it has an external validity, it is limited because it isn't general to apply to other population.