Question Detail
Question
All the digestive are formed in vertebrates by:
Correct Answer
Option B is the correct answer.
Detailed Explanation
The epithelial lining of the digestive tract (from the pharynx to the rectum) is derived from the endoderm (the innermost germ layer) in vertebrates. The associated connective tissues, smooth muscle, and blood vessels are derived from mesoderm, but the question specifies 'digestive' likely referring to the digestive epithelial lining, which is endodermal in origin.
Hint
Which germ layer forms the lining of the gut tube?