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 digestive enzymes.

Dr. arenas is a scientist who has been trying to determine if increasing pressure will increase the sound that occurs when two chemicals explode. it measures the volume of the sound that occurs at the minimum pressure at which the explosion will occur. it then increases the pressure and measures the volume of the explosions that occur. what kind of investigation is the scientist conducting?