Which key human trait did hunter-gatherer groups depend on to survive?

a.
intelligence
b.
imagination
c.
shared knowledge
d.
alertness
e.
versatility

Ineed with what i should write for my research paper. my topic is history of slavery. 1800 words. all i need is what to write in each paragraphs. like when the research paper has titles for each paragraph and it explains the tile in each paragraph. for example when did slaverh begin? why did it begin like an outline.

What enabled the drastic increase in us troop development to vietnam between 1964 and 1965?

What is the name for the main idea behind the settling of western lands by americans in the early-1800s?