Question

when a person ingests caffeine, whether in the form of a cup of coffee or tea, a caffeinated soda, or even a piece of dark chocolate, the drug begins to take effect almost immediately. first, caffeine enters the bloodstream through the membranes of the stomach and small intestine. it is then metabolized by the liver, which breaks it down into other chemicals. within fifteen minutes of consumption, most people begin to feel the effects of caffeine, which can include increased heart rate and feelings of alertness or well - being. within six hours of consumption, about half of the original dose of the drug will have been eliminated from the body. this is why some people drink a second cup of coffee in the afternoon.
which organizational structure does this text primarily use?
problem - solution
sequential
compare - contrast

Explanation:

The text describes the process of caffeine ingestion and its effects in a step - by - step manner. It starts with caffeine entering the bloodstream, then being metabolized, and mentions the time - based effects (within fifteen minutes, within six hours). This is characteristic of a sequential (or chronological) organizational structure as it follows a sequence of events. A problem - solution structure would present a problem and then a solution. A compare - contrast structure would involve comparing and contrasting different elements. Since the text is focused on the sequence of events related to caffeine, it is not problem - solution or compare - contrast.

Answer:

sequential