Most peasants were also serfs
hope this helps :)
She is assessing sources (or evaluating them). To check validity and reliability.
She'll need to check the author, who wrote it and from whom, if the source is primary or secondary, if the material is not outdated, and is valid. Written sources, non-textual as photographs, and other pieces of evidence.
1) the overall global wind patterns
2)the rotation of the Earth
3)the shape of the ocean basins
B.Cold war because it was the beginning of the nuclear research