levels of organization

Subatomic

Protons , electrons and electrons that make up a cell

Atoms

Tiny particles that makes up chemicals ( hydrogen, carbon )

Molecules

Particles consisting of atoms joined together ( water , glucose )

Macromolecules

Large particles consisting of molecules ( DNA , Proteins )

Organelle

Functional parts of a cell ( Mitochondrian , Lysosomes)

Cell

Basic unit of structure and functions ( muscle , nerves , and blood cells )

Tissue

Layer or mass of cells with a specific functions ( adipose and epithelial )

Organ

Group of different tissues with a function ( heart , kidney , stomach

Organ system

Group of organs with common function ( digestive system

Organisms

Composed of interacting organ systems ( humans )