They change based on where the moon is relative to the Earth. Believe it or not, the Moon's gravity effects Earth. The way you can see that is by where the tides are. A low tide is produced when the moon is closest to that body of water (or farthest, see link).
same
there are two tides a low tode and a low each happen once a day
If you mean which of these bodies has the strongest gravitational field then the Sun wins by a very large margin. This is because the strength of a gravitational field is governed by an object's mass and the Sun is the heaviest. After that the Earth is the most massive and finally the moon. So the order is Sun, Earth and Moon.
low tide in the night high tide in the day
Then we would die i doubt that any thing drastic would happen probably not as wet sand at beaches :D
Twice a day. Same as high tides.
it dosent happen
2 times
same
If there were no tides, Earth wouldn't be the same
If you mean "tides" as in waves... Tides happen from the moon's gravity pulling up on the water.
Tides
Only2 high tides happen a day
I think it low tides because nothing causes high tides to happen in Neptune
most low tides happen only twice a day.
Tides ebb and flow twice a day.
The exact shape of the ebb and flow (rise and fall) is different everywhere. But in general, it's two highs and two lows, alternating, in slightly over 24 hours.