Answer:
the internal organ in which the major part of the digestion of food occurs, being (in humans and many mammals) a pear-shaped enlargement of the alimentary canal linking the esophagus to the small intestine.
The bladder is the muscular organ that holds urine
I think the answer is most likely A
It's called appendages if that is what you need
Because we can’t tunnel down, so in order to study the interior layers, we must use indirect methods.
