In this unit, you learned how humans evolved from their earliest days to the beginning of civilizations in settled communities. What do you think are the traits that make humans human? Explain why you think these traits are important.

option d is correct. corroborated sources of historical evidence   is necessary to validate a claim about an event in history.

historians tend to use written sources, but audio and visual materials as well as artifacts are important objects that supply information to modern historians.

historical sources are usually divided into two categories: primary and secondary sources. depending on the historian's intent, some sources shift their designation. determining what type of sources toimplement, and the level of credibility and reliability of those sources, is a significant step in critical thinking for the historian.

explanation:

the answer to this question is the third option. hope this

newly independent countries of the former ussr