Whenever diploid populations are in hardy-weinberg equilibrium at a particular locus

Explanation:

Hardy Weinberg equilibrium states that in a population, the sum of allelic frequencies as well as genotypic frequencies remains same over generations

There are five assumptions regarding this equilibrium: there should be random mating, no immigration and emigration, no mutation, no natural selection and population should be large and non evolving

Whenever diploid populations are in Hardy Weinberg equilibrium at a particular locus the allele's frequency should not change from one generation to the next, but its representation in homozygous and heterozygous genotypes may change    

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estuaries are the partially enclosed coastal bodies of brackish water formed at the mouth of sea where river meets an ocean. it is a transition zone between river and sea water so estuaries are influenced to both marine environment such as tides, waves and to riverine such as flow of fresh water and sediments. the mixing of sea and fresh water provide high level of nutrients, making estuaries a high product habitats.

many estuaries suffers degradation from a variety of human activities like erosion from deforestation, overgrazing, overfishing, drainage and eutrophication.

so from the above statement answers will be

1. false as estuaries are formed due to both brackish and freshwater.

2.true, due to high productivity estuaries are breeding ground for many marine species.

3. direct and indirect activities of man that contribute to pollution and deposition of sediments.