Which major process involves the removal of water from intestinal contents?
a. absorption.
b. ingestion.
c. defecation.
d. mechanical breakdown

a. Absorption

Explanation:

In order to answer the question, we need to review basic definitions.

ABSORPTION:

It is the process by which the body uptakes various molecules of digestive material. In this way various nutrient are added into the body.

e.g. uptake of amino acids in the small intestine is an example of absorption. Similarly, the removal of water by the body in the intestines.

INGESTION:

It is the process by which various food substances are introduced into the body via the mouth.

e.g. if you eat an apple; you are actually ingesting an apple.

DEFECATION:

It is the process by which left over digestive materials are removed from the body.

e.g. passing feces

MECHANICAL BREAKDOWN:

It refers to the various processes by which complex food substances are broken down into small ones. It involves mechanical or physical actions like chewing and churning movements of stomach.

e.g. breakdown of large apple pieces ingested by mouth into smaller ones.

It is clear from the above discussion that removal of water from intestinal contents is an example of absorption because in this process body uptakes water molecules.

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your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.