What is a challenge that organisms living in an estuary face that other aquatic organisms normally do not face?

Name: What is a challenge that organisms living in an estuary face that other aquatic organisms normally do not face?
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Organisms living in an estuary face daily changes in salinity due to the mixing of freshwater and saltwater, which can make it challenging for them to maintain their internal salt balance. This is a unique challenge that other aquatic organisms normally do not face.

What Is a Challenge That Organisms Living in an Estuary