1/3 of the deaths did not come from weapons, but from (also this is talking about in world war 1) (also if you put random stuff or links i will report)

disease

Explanation:

in the trenches it was very unsanitary, and things like swine flu and trench foot were on the rise

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.

just finished this it is b. centrifugal force