Biological organization starts at the submicroscopic level because it is at this level that the fundamental building blocks of life, molecules and atoms, interact and form the basis for all biological processes.

Here's why it's crucial to start at the submicroscopic level:

* Atoms and Molecules: Life is built upon the interactions of atoms and their arrangement into molecules. These interactions define the properties of water, proteins, nucleic acids, lipids, and carbohydrates – the essential components of cells.

* Cellular Structures: Submicroscopic molecules assemble into larger structures like organelles within cells. Organelles like mitochondria, the nucleus, and the endoplasmic reticulum are responsible for carrying out essential functions like energy production, genetic information storage, and protein synthesis.

* Cellular Functions: The complex interactions of molecules within organelles determine how cells function, grow, and reproduce.

* Tissue Formation: Cells with similar structure and function come together to form tissues, like muscle tissue or nervous tissue.

* Organ Formation: Different tissues work together to form organs, like the heart or the brain.

* Organ Systems: Multiple organs collaborate to form organ systems, such as the circulatory system or the digestive system.

* Organism: Finally, all the organ systems work together to create a complete organism.

In essence, the submicroscopic level provides the foundation for all higher levels of biological organization. Understanding the interactions and properties of atoms and molecules is crucial for understanding how cells, tissues, organs, and organisms function.