In 275 bc who was called to investigate the possible forgery of the king of syracuse’s gold crown

The correct answer is "Archimedes."

In 275 BC the man who was called to investigate the possible forgery of the king of Syracuse’s gold crown was Archimedes.

Archimedes knew that gold was denser than silver. That being the case, a piece of gold should be smaller than a piece of silver of the same weigh. So Archimedes compared the volume of the crown to the volume of the amount of gold that Hiero had given the goldsmith. That is when Archimedes used the bucket with water to introduce the crown and see how much water was displaced.

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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i googled "who was kolson johanson" and this is the answer i found.

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c, because the american revolution was from 1765 to 1783.