The complete digestive tract of nematodes and other phyla allows functional specialization. What specialization a are common in the digestive tract of higher organisms such as humans?

In higher organisms like humans, the digestive tract exhibits significant functional specialization to enhance nutrient absorption and processing. The mouth is adapted for mechanical breakdown of food, while the stomach provides an acidic environment for enzymatic digestion. The small intestine is highly specialized for nutrient absorption due to its extensive surface area, aided by villi and microvilli. Additionally, the large intestine focuses on water reabsorption and the formation of feces, highlighting the efficiency of the digestive system in nutrient utilization and waste elimination.