There are also instances, however, where people are Rh-Negative.
Health problems may occur for the unborn child of a mother with Rh-Negative blood when the baby is Rh-Positive.
This exercise is designed to introduce you to basic techniques used in determining the age of archaeological materials and sites.
There are two general categories of methods for dating in archaeology.
The isotope of Potassium-40, which has a half-life of 1.25 Billion years, can be used for such long measurements.