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This is like asking "do stars need planets?" The simple answer is that they dont. However for complex life to have a chance to evolve on a planet the planet needs to have a stable axis around which it rotates (spins) and tilts (which gives us our seasons) and not to tilt beyond a cetainnumber of degrees there would be an extreme of temperatures, the earths moon stabilises our axial tilt ensuring that there is little extremes of temperature.

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16y ago

What else can I help you with?