D becuase it is smooth like a road like a real city.
the cell theory
- all cells come from pre-existing cells
-cells are the basic unit of life
- all organisms are made up of.one or more cells
The answer is intercalated discs. They allow the heart muscle cells to function as one organ due to a phenomenon known as syncytium. This is where uninuclear cells fuse to form an apparent multinucleate cell. This way the heart muscle cells can contract in synch. Intercalated discs appear in the sarcomere's (of the muscle fibres) Z line.
Photosynthesis occurs in plant cells