In october 2012, one us dollar could buy about canadian dollars. a. 0.88 b. 0.98 c. 1.08 the exchange rate remained unchanged from a. oct. 2012 to jan. 2013 b. dec. 2012 to jan. 2013 c. jan. 2013 to mar. 2013 the us dollar grew stronger against the canadian dollar from a. oct. 2012 to jan. 2013 b. dec. 2012 to jan. 2013 c. jan. 2013 to mar. 2013

B, B, C

Explanation:

0.98

Dec. 2012 to Jan. 2013

Jan. 2013 to Mar. 2013

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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question - in the 1900s there were two competing views about the environment that often pitted industrialist and conservationist against one another. how were these two competing views demonstrated by the environmental policies of president roosevelt and president taft?

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