plz help me well mark brainliest if correct!.

What would be considered a secondary source about the assasination of abraham lincoln

What was one important characteristic of the russian military during world war i? a. it had more advanced military technology than its western european allies. b. it was an all-volunteer military that enjoyed high morale throughout the war. c. it defended russian territory but refused to attack german positions d. it was unable to provide its forces with adequate weapons and supplies.

Which kind of map you would be used to show population density in the countries of the world