The most important difference between muddy intertidal shores and the mud flats of estuaries:

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The most important difference between muddy intertidal shores and the mud flats of estuaries is the variation in salinity. Muddy intertidal shores are regularly exposed to sea water, whereas the mud flats of estuaries are exposed to both fresh water and salt water, resulting in a wider range of salinity levels. The other choices may also be different between these environments but are not the most important difference.

The Most Important Difference Between Muddy Intertidal Shores and the Mud