Early and Late Middle Ages question Invasions of Europe by outsiders caused the need and development of .

Feudalism.

Explanation:

When the Roman Empire fell, Germanic invaders began pushing into the territory. The empire had offered them protection, but with many warring kingdoms being established- that protection was not being given. Peasants began offering serfdom in exchange for protection and land. This led to the intricate web of loyalty, vassals, lords, and peasants that we know of today.

i can try to solve it just show the graph.

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.