Explain the difference in relative price elasticity es of the following services: heart transplant operations, lawn care, tanning salons?

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:

c) he felt the constitution clearly gave states this right.

the answer is a the rich and poor get an equal share of the power and wealth

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