Chemically speaking, enzymes are composed of chains of and they are considered to be a type of a) fatty acids, lipid b) amino acids, protein c) nucleotides, nucleic acid d) monosaccharides, carbohydrate

B) amino acids, protein

Explanation:

Most enzymes are chains of amino acids, this means that eventually this will form protein, enzymes are the molecules in charge of catalyzing biochemichal process in living beings, enzymes are in charge of setting in motion, slowing down or speeding up biochemical processes, they are basically in charge of finding the correct timing for the biochemical processes that happen in all the biological processes.

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.