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.