Atoms however can join together to form molecules. Molecules are made of atoms. Molecules encompass atoms. Molecules are more complex than atoms. Molecules are holons because they are complete and consistent within themselves and because they can be organised into a basic living cell.
Cells are holons which can form a body organ.
Each stage is a holon which includes the level before it and is included in the level after it. We must move from one level to the next. We cannot skip levels. These four can be extended with subgroups to seven steps which align with our chakra system. Using Wilber's spectrum, extended even more, so many of the systems desribing levels of consciousness can be included within a consistent whole.