Answer :

Low and high tides happen every 24 hrs.
2Low and 2high tides in a day in beaches.
Rotation of Earth makes tides.

The alternating rise and fall in sea level with respect to the land, are called tides. They are produced by the gravitational attraction of the moon and the sun. Every day, there are 2 high and 2 low tides. The water is constantly moving because the moon pulls at it.

Question: Tides _____.

Answer: D.  are caused by the moon's gravity