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 ene

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.