Which description accurately reflects the digestive and excretory systems?

• A. Regulating hormones
• B. Converting food into energy, transporting nutrients, and removing waste via digestive tract
• C. Removing carbon dioxide by breathing
• D. Filtering blood in the kidneys

Answer: (B)

The main idea is that these systems work together to turn food into usable energy and nutrients and then remove wastes from the body. The digestive system breaks down food into nutrients and energy; those nutrients are absorbed and transported through the body to cells that need them. The excretory side helps eliminate waste, with solid waste leaving through the digestive tract and other wastes handled by the kidneys and urinary tract. This description also captures the full cycle—from ingestion and digestion to nutrient transport and waste elimination—whereas the other options point to different systems (endocrine, respiratory, or purely renal functions) that don’t describe these two systems together.