Question

what is the correct order of structures that a piece of food would encounter as it travels through the alimentary canal of a bald eagle?

○ mouth, esophagus, stomach, crop, gizzard, intestine, anus

○ mouth, esophagus, crop, stomach, intestine, gizzard, anus

○ mouth, esophagus, crop, stomach, gizzard, intestine, anus

○ mouth, esophagus, crop, gizzard, stomach, intestine, anus

Explanation:

Bald eagles (birds) have a digestive tract where food enters the mouth, goes down the esophagus to the crop (for storage), then to the stomach, followed by the gizzard (for mechanical digestion), then the intestine for nutrient absorption, and finally exits via the anus. Let's analyze each option:

• First option: Stomach before crop is incorrect (crop is for storage, comes before stomach in birds' digestion).
• Second option: Intestine before gizzard is incorrect (gizzard is for grinding, comes before intestine).
• Third option: Mouth → esophagus → crop → stomach → gizzard → intestine → anus. This follows the correct order of a bird's alimentary canal.
• Fourth option: Gizzard before stomach is incorrect (stomach is where chemical digestion starts, gizzard is after for mechanical processing).

Answer:

C. mouth, esophagus, crop, stomach, gizzard, intestine, anus (assuming the third option is labeled C; if the original options had labels like A, B, C, D, adjust the label as per the original, but based on the content, the third option is correct with the order mouth, esophagus, crop, stomach, gizzard, intestine, anus)