The axis of Earth' s daily rotation is tilted with respect to the plane of its orbit at an angle of roughly 23 degrees  That angle can be kept fairly stable only by the gravitational influence of Earth' s large, nearby Moon  Without such a stable and moderate axis tilt, a planet' s climate is too extreme and unstable to support life
Mars, for example, has only very small moons, tilts at wildly fluctuating angles, and cannot support life
If Earth's Moon were to leave Earth's orbit, Earth's climate would be unable to support life.