Takes in nutrients, breaks them down, and eliminates unabsorbed matter (feces).

• A. Digestive system
• B. Urinary system
• C. Respiratory system
• D. Nervous system

Answer: (A)

Digestive system. It handles taking in food, breaking it down into smaller molecules, absorbing the nutrients, and forming and eliminating waste as feces. The mouth and stomach begin mechanical and chemical digestion, the small intestine does most of the nutrient absorption with help from enzymes, and the large intestine removes water and turns indigestible material into feces for elimination. The urinary system deals with liquid waste, the respiratory system with gas exchange, and the nervous system coordinates functions but does not perform food digestion or fecal formation.