Question

what are primary sources? (check any that apply)
letters written by people describing their thoughts on an event
an excerpt from a historians book on the american revolution
documents that originated from the time period being studied
journal or diary entries
newspaper articles/headlines
biographies about a historical figure
rewatch
submit

Explanation:

Primary sources are original materials from the time - period under study or created by individuals directly involved. Letters, documents from the time - period, journal/diary entries, and contemporary newspaper articles can be primary sources. A historian's book and biographies are secondary sources as they interpret and analyze primary sources.

Answer:

Letters written by people describing their thoughts on an event
Documents that originated from the time period being studied
Journal or Diary entries
Newspaper articles/headlines