What if the Moon disappeared
The moon has never stopped orbiting Earth so no one knows for sure. But in theory we would die if the moon stopped orbiting Earth because without the moon the average Earth day would only be 6 to 8 hours long. This may sound good. But in reality it's bad.
This means that earth would be rotating 3 to 4 times faster than now. Without the moon Earth would orbit faster because the Moon stabilizes Earths rotation. The Moon stabilizes our planet because it causes the tides to shift and puts pressure on the Earth which results in slower rotation. This why we have days that are 23 hours and 56-minute long.
Earth rotating 3 to 4 times faster than now. It Would cause winds to travel 480 kilometers per hour. This means that all the birds and insects would perish. With these strong winds only deeply rooted plants would survive, and some short stocky animals. Most of our sea life would die: Due to strong of strong currents.