The slow down of earth s rotation due to the loss of mechanical energy of earth moon system is since _______ years from earth s formation.

The slow down of earth s rotation due to the loss of mechanical energy

1.	The slow down of earth s rotation due to the loss of mechanical energy of earth moon system is since _______ years from earth s formation.
A.	1 billion
B.	2.5 billion
C.	3.5 billion
D.	4.5 billion
Answer» E.