What do the pancreas, liver, salivary glands, and gall bladder have in common?
- they are all involved in mechanical digestion.
- they are all accessory structures.
- they all digest carbohydrates.
- they all release digesting enzymes.

- They are all accessory structures.

Explanation:

The accessory digestive organs are the teeth, the tongue, the salivary glands, the liver, the gallbladder and the pancreas. The teeth assist in the physical breakdown of food and the tongue assists in chewing and swallowing. The other accessory digestive organs never come into direct contact with food. They produce or store secretions that pass into the gastrointestinal tract and assist in the chemical decomposition of food.

Accordingly, we can say that the correct answer to your question is "They are all accessory structures."

the answer would be 3