Question

the digestive system includes:
a organs of the gi tract.
b salivary glands.
c liver and gallbladder.
d pancreas.
e partially visible

Explanation:

The digestive system consists of the gastrointestinal (GI) tract (option A), accessory organs like salivary glands (B), liver and gallbladder (C), and pancreas (D). All these are part of the digestive system. But if we consider the main components, the GI tract organs (A) are a core part, and the accessory organs (B, C, D) also belong. However, since the question is about what the digestive system includes, all A, B, C, D are correct. But maybe the intended answer here (if we assume a multiple - correct or the question's context) – the digestive system includes organs of the GI tract (A), salivary glands (B), liver and gallbladder (C), and pancreas (D). If we have to pick all correct ones:

Answer:

A. organs of the GI tract, B. salivary glands, C. liver and gallbladder, D. pancreas