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-O-uknow
ANSWERS: 3
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Seasons are caused by every point on Earth (save for the poles) getting a cyclically varying exposure to the Sun, due to the fact that the Earth is rotating about a tilted axis (one that isn't orthogonal to its orbit), and (to a lesser extent) because of Earth's orbit being elliptical rather than circular. I can't find any resources on when during its formation or early history Earth settled into its current orbit, but assuming that Earth's axial tilt and orbital eccentricity arose during its formation (which strikes me as likely), you would say that it's always had seasons, yes.
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Yes. Seasons are caused by the axial tilt of the earth, and if something has an axial tilt it cannot get rid of it without passing the angular momentum to something else. So it has almost certainly had an axial tilt, and thus seasons, since the planetary collision now believed to have formed the moon. This probably occurred while the earth was still mostly molten and long before the origin of life.
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probably
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