Final answer:
The alimentary canal in adults is approximately 25-30 feet long. It nourishes the body through the absorption of digested food and includes the small intestine, which plays a major role in digestion and nutrient absorption. The correct answer is option C.
Step-by-step explanation:
The alimentary canal is approximately 25-30 feet long in adults. This is equivalent to about 7.62 meters (25 feet) in a living person and can extend up to 10.67 meters (35 feet) after death due to the loss of muscle tone. The alimentary canal, also known as the gastrointestinal (GI) tract or gut, starts at the mouth and ends at the anus, and it's designed to nourish the body by processing food into nutrients that can be absorbed.
The small intestine is one of the most significant parts of the alimentary canal when it comes to digestion and absorption. It is around 3.05 meters (10 feet) long in a living person and is where most of the body's digestion and nutrient absorption occurs, thanks to its large surface area aided by numerous folds and projections of its lining.The correct answer is option C.