Answer:
a. the amount of biologically productive land/sea area needed to support the lifestyle of humans
The population density of <u>Western China</u> is so low in comparison to Eastern China is due to most of its area is under mountainous.
<h3>Why population density of Western China is lower than in Eastern China?</h3>
The areas of western China have dramatic mountainous which make the livelihood of the region harsh that<u> reduces its population</u>. The agricultural yields also get destructed with low temperatures all around the year.
The population in Eastern China is more humid with <u>sea and plane lands</u>. Thus, living conditions are normal for survival making its population more than wester areas.
Learn more about the geography of China here:
brainly.com/question/5998222