enzymes
Eating
They are called digestive enzymes. There are many that are used in the process, beginning in the mouth with enzymes that begin the break down of starches.
the answer is stomach acids
A sac filled with digestive chemicals would likely belong to an organism with a type of digestive system where digestion occurs externally. Examples include certain insects like beetles and spiders that use their digestive sacs to break down and pre-digest food before consuming it. The chemicals in the sac help to breakdown food particles into smaller, more digestible components.
The stomach
yes
vacuole
The urinary system flushes out unusable chemicals that are extracted from the food by the digestive system.
Digestive (hydrolytic) enzymes are stored in lysosomes, which will fuse with a food vacuole.
The liver is an organ of the digestive system, it produces the chemicals needed for digestion.
Phytochemicals are the natural chemicals in plants. Only a few of these chemicals have been linked to improved health--like beta-carotene, lycopene, and salicine (which became aspirin)--but eating vegetables is a wise choice to improve nutrition and digestive function.
The inner of us!