Matching Digestive Functions to Labeled Parts

Steps:

• Identify key digestive organs: esophagus transports food, small intestine absorbs nutrients.
• Review function list: 1=mechanical digestion (mouth), 2=food transport (esophagus), 3=acid breakdown (stomach), 4=nutrient absorption (small intestine).
• Match labels to diagram: assume labels point to esophagus and small intestine.
• Select pair aligning with transport and absorption roles.

Why D is correct:

• Functions 2 and 4 define transport via peristalsis and absorption of digested nutrients, matching esophagus and small intestine per standard anatomy.

Why the others are wrong:

• A: 1 involves chewing in mouth, not labeled parts.
• B: 1 mismatches transport or absorption sites.
• C: 3 describes gastric acid action in stomach, irrelevant here.

Final answer: D