The feudal lord compensated the serfs by

Serfs who occupied a plot of land were required to work for the lord of the manor who owned that land. In return they were entitled to protection, justice, and the right to cultivate certain fields within the manor to maintain their own subsistence.

Explanation:

1.the population change is near or at replacement level.

4. the birth and death rates are balanced.

6. sweden is most likely a developed country.

the name of the theory is landmass theory.