What is one problem that might commonly occur when one is bartering? someone wants to trade a valuable item for a less valuable one. two people have different ideas about the value of an item. someone wants to barter a good in exchange for a service. two people want to trade items of equal or nearly equal value.

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:

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they consider la nina a warm place and el nino a cool place but all aoround its pretty neatrual