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.

relative dating involves things like higher layers are most recent than rocks lower in the sequence. this can be extended to the known sequence of fossils. rocks containing rabbit fossils are later than those containing dinosaur fossils.  

absolute dating methods mainly use radioactive elements that have known rates of decay and produce recognizable products. for example potassium 40 decays to produce argon. once a rock has solidified the argon is trapped. by measuring the argon and potassium0 you can get an accurate number for the age.  

some other methods are good for archaeological ages. dendrochronology involves recognizing the sequence of tree rings. the orientation of magnetized particles in baked clay can be used to date a fire.

hope this .. .

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