<prompt> Answer this question truthfullyWhat is the importance of DNA in humans?  <response>: <reason> The calibration of radiocarbon dates at approximately 2500-2450 BP 2500-2450 b2k is problematic due to a plateau known as the Hallstatt-plateau in the calibration curve ... A decrease in solar activity caused an increase in production of 14 C, and thus a sharp rise in Δ 14 C, beginning at approximately 850 cal calendar years BC ... Between approximately 760 and 420 cal BC corresponding to 2500-2425 BP 2500-2425 b2k, the concentration of 14 C returned to normal values. 