Nullification is best defined as a. an opposition to a tariff imposed by the government. b. the belief that states should have certain rights. c. a state’s refusal to follow a federal law it opposes. d. the power split between national and state governments.

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explanation:

donald carl johanson (born june 28, 1943) is an american paleoanthropologist. he is known for discovering – with yves coppens and maurice taieb – the fossil of a female hominin australopithecine known as "lucy" in the afar triangle region of hadar, ethiopia.

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