How do the chromosones separate in anapase 1

Explanation:

During anaphase, each pair of chromosomes is divided into two equal, independent chromosomes. Chromosomes are separated by a structure called the mitotic spindle. The mitotic spindle is made up of many long proteins called microtubules that are attached to a chromosome at one end and a cell pole at the other end. Sister chromatids separate simultaneously on centromeres. The separated chromosomes are then drawn into the spindle to the opposite poles of the cell.

i'd say that the moon rock is about 2.2 billion years old.