Amacromolecule that contains carbon hydrogen oxygen and nitrogen which is used for the body for growth and

Proteins.

Explanation:

Biomolecules are the macromolecules and the organic compounds required for the growth of the living organism. Four important biomolecules are carbohydrates, proteins, lipids and proteins.

Proteins are the polymers of the amino acids linked together through the peptide bond. The proteins are made up of carbon, hydrogen, oxygen and nitrogen. Proteins are the main building block of the body and required for the proper growth of the living organism.

Thus, the answer is proteins.

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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.