Which is the purpose of China’s population control policy?

The purpose of china's is the control of birth

Explanation:

Because tcitizens must obtain a birth certificate before the birth of their children. The citizens would be offered special benefits if they agreed to have only one child.

crop rotation kepy different plants in the soil instead of once constintly. when switching out plants you have different nutrients being absorbed at different speeds and different roots growing differently therfore the spoil and water flow have to adapt and carry fresh nutrients to carry the constant changes that were going on in the soil.