Carbohydrate molecules have all of the following bonds except- a. c-c b. c-n c. c-h d. c-o

B. C-N

Explanation:

Carbohydrates are bio-molecules which are basically made up of three elements named as carbon (C), hydrogen (H) and oxygen (O) so they will have bonds like C-C, C-H & C-O but will not have C-N bond.

Carbohydrates mainly serve the function of providing energy to the body. The energy lies in the the chemical bonds of carbohydrate molecules which is released when the these bio-molecules are oxidized in the presence of air.

Carbohydrates can exist as monosaccharides, disaccharides or polysaccharides.

Monosaccharides like glucose and fructose are the simplest and instant source of energy.

Disaccharides are sucrose, maltose, and lactose.

Polysaccharides like glycogen (in animals) and starch (in plants) are used for the storage of carbohydrates so that they could be used for energy in future.

whats the answer to your question?

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.