Answer:
A
Explanation:
An isolated system can NOT exchange energy or matter with it's surroundings. This is why it is isolated.
Esophagus
Stomach
Small intestine
Large intestine
Cloaca
That's just the alimentary track (minus the couple that come before esophagus such as mouth and pharynx) so if you need digestive glands and accessory organs let me know cause I know those too
The BEST example of technological design is researching a disease resistant corn hybrid.