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

please select the best answer from the choices provided

a
b
c
d

Explanation:

Salt marshes are coastal ecosystems directly connected to the ocean. Ocean tides follow a daily cycle (high and low tides twice a day, typically). High tides bring more saltwater into the marsh, increasing salinity, while low tides drain saltwater, lowering salinity. River flow does not typically change on a daily cycle to drive consistent daily salinity shifts; daily winds/rain are less predictable and not the primary daily driver; salt collecting in low elevations is a static feature, not a daily variable.

Answer:

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