Why is it necessary for a historian to be sure of the authenticity of a primary source?

What did europeans build much of during the eleventh and twelfth centuries? ?

What is the evidence that depression can be linked to genetic as well as environmental factors? a. all individuals in similar stressful environments do not experience depression. b. all individuals with the gene variation tied to depression do not experience depression. c. individuals with a combination of environmental stress and gene variation are more likely to experience depression d. all of the above select the best answer from the choices provided оа 0 0 0

The first settlement created by the pilgrims in 1620, came for religious freedom. i'm failing history