how different would life on earth be if there was no moon?
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No tides, dramatic change in weather and the Earth might be significantly cooler due to tidal forces not being present heating deep in the Earth
Among other things, the moon stabilizes the earth’s rotation.
Earth’s axial tilt changes over a cycle of 40.000 years, but only a little bit: Its currently at 23.5° and will always be between 22.1° and 24.5°.
Without the moon, these fluctuations would be MUCH bigger, resulting in a much worse ice age cycle. Considering that our regular ice ages already buried much of North America and Eurasia under a mile of ice, which by the way also changed the sea level by more than a hundred meters, a moonless ice age becomes hard to imagine.
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