Why do most Chinese people live in eastern China?

Most Chinese people live in eastern China because there are less mountains and rainfalls than the west. Less mountain equals less rainfalls because it block the passage of rain weather systems which cast a shadow of dryness behind them.

The correct answer is a)  a resource with a limited supply; it will run out.

When a lake, river or other aquatic  system  becomes  eutrophic, it can have serious negative effects on other organisms like fish, birds and even people.if an algal bloom is so bad that it causes wide-spread death  in  the  water, the organisms that die will all sink to the bottom and start to decompose.