Chemical digestion in the small intestine involves a. a significant amount of enzyme secretion by the intestinal mucosa b. cholecystokinin (cck), an intestinal hormone responsible for gallbladder contraction c. secretions from the spleen that contain all enzymes necessary for complete digestion d. bile salts that emulsify carbohydrates so that they can be easily digested by enzymatic action

b.cholecystokinin (CCK), an intestinal hormone responsible for gallbladder contraction

Explanation:

Chemical digestion is the process that involves the breakdown of chemical bond that holds food particles together into small parts to nourish the cells in the body. Thus, almost all chemical digestion takes place in the small intestine and enzymes used for the purpose of digestion are usually secreted by the pancreas which enters the small intestine through pancreatic duct. Furthermore, the entrance of digestive enzymes into the small intestine can only occur only when cholecystokinin hormone is secreted which is responsible for digestion of fats and protein.

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the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.