Question

The salinity in salt marshes can vary throughout the day because _______.
a.
river flow changes throughout the day
b.
the amount of salt water in a marsh depends upon ocean tides
c.
daily winds and rains result in salt and fresh water mixing
d.
salt water collects in the lowest elevations

Answer 1

b. the amount of salt water in a marsh depends upon ocean tides

Explanation: Tidal cycles flood and drain marshes daily, bringing in seawater (higher salinity) at high tide and diluting with freshwater at low tide, so salinity changes over the day.