The arthropod digestive system is:

The arthropod digestive system is:

• A. Complete; two openings
• B. Incomplete; one opening
• C. Absent
• D. Open loop

Answer: (A)

Arthropods have a complete digestive system with two openings, a mouth and an anus. This one-way tube lets different regions specialize—foregut for intake and mechanical processing, midgut for digestion and nutrient absorption, and hindgut for water reabsorption and waste formation. Having two openings distinguishes it from an incomplete gut, which would use a single opening for both entry and exit, and the idea of an “open loop” doesn’t describe the gut’s structure. The two-opening arrangement best captures how the arthropod digestive tract is organized and how digestion proceeds through a connected, multi-part tube.

Arthropods have a complete digestive system with two openings, a mouth and an anus. This one-way tube lets different regions specialize—foregut for intake and mechanical processing, midgut for digestion and nutrient absorption, and hindgut for water reabsorption and waste formation. Having two openings distinguishes it from an incomplete gut, which would use a single opening for both entry and exit, and the idea of an “open loop” doesn’t describe the gut’s structure. The two-opening arrangement best captures how the arthropod digestive tract is organized and how digestion proceeds through a connected, multi-part tube.