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The statements that best describes an unintended environmental consequence of aquaculture fish-farm enclosures located in estuaries is Aquaculture enclosures can harbor parasites that can negatively affect wild populations that breed in estuaries.
<h3>What is an estuary?</h3>
An estuary can be regarded as partially enclosed, water body which consists of mixture of freshwater from rivers as well as salt water from the ocean.
However, unintended environmental consequence of aquaculture fish-farm enclosures located in estuaries is that parasite can be easily decrease the populations of breed.
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Polyatomic ions describes ions which are posses more than one atom. Hence, the formula which represents a polyatomic atomic ion is 
- Sulphates contain both Sulphur and Oxygen atoms, hence, they contain two atoms, thus they are polyatomic.
- Sulphide are represented as
; containing only Sulphur atom, hence, they are mono atomic.
- Chlorides are represented as
; containing only chlorine atoms, hence, they are mono atomic.
- Nitrides are represented as
; containing only Nitrogen atom, hence, they are also mono atomic.
Therefore, sulphates are polyatomic as they contain more than one atom.
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