Question

which of the following varies daily?
shoreline
beach
coastline
shore

Explanation:

The shoreline is the area where the water meets the land. Tides cause the water level to rise and fall daily, which changes the shoreline. Beaches can change over time due to erosion and deposition, but not as daily as the shoreline. Coastlines are more permanent geographical features. The shore is a general term for the land along the edge of a body of water and is not as specific to daily change as the shoreline.

Answer:

shoreline