By measuring how much carbon is left in bones, scientists can tell

By measuring how much carbon is left in bones, scientist can tell the Age of the artefacts.

Explanation:

Carbon 14 dating is a technique use by archaeologists to determine or know the age of artefacts. Through this method scientists can determine how long an organism died by measuring how much carbon is left in the bones. Living organisms absorb carbon by eating and breathing, when an organism died the carbon left in the bone begin to decrease, so the carbon 14 can be use to date organism that is about 4000 years old, after that it can not date organism higher than that because carbon 14 decreases as time goes on when organisms died.

b) a state law could be declared illegal if it contradicted the constitution.

explanation:

the conflict of this case originated when james w. mcculloch, a cashier of the baltimore branch of the second bank of the united states that the congress had chartered in 1816, refused to pay a tax imposed by the maryland state.

in the case, the state of maryland appealed that the establishment of a second bank was unconstitutional since the constitution didn't say anything about granting that power to congress. however, the case determined that even if such right wasn't specifically stated in the constitution, it was part of the "implied powers" of the government enunciated in article i, section 8.

the case also eliminated maryland's legislation to impose taxes to a national bank, asserting that even though the states retained the power of taxation, the constitution's laws are supreme and can not be controlled by the states, therefore, if a state law contradicts the constitution, it should be declared illegal.

explanation:

the answer is d. party organizers, volunteers, voters and elected officials.