Precession of Earth's axis of rotation is caused by:
A) changes in the rate of rotation (length of the day) of Earth caused primarily by the gravitational pull of the Moon.
B) changes in the shape of Earth's orbit due to the gravitational pull of the Moon.
C) the gravitational pull of the Moon and the Sun on the equatorial bulge of Earth.
D) changes in the shape of Earth's orbit due to the gravitational pull of the Sun.
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