10 A cyclical series of events observed in
Eukaryotic cells, including a cell's primary
functional period (interphase), nuclear division
(mitosis), and cellular division (cytokinesis)

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

c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.

silty loam

hope this