Final answer:
The liver and heart are not directly in the midline, but the stomach is.
Step-by-step explanation:
The liver is not directly in the midline. It is located in the upper right part of the abdomen, below the diaphragm and behind the rib cage.
On the other hand, the heart is not directly in the midline either. It is located slightly to the left side of the chest.
The stomach, however, is directly in the midline of the body.