Final answer:
The human body hierarchy starts with the atom, moves up to molecules, organelles, cells, tissues, organs, organ systems, the complete organism, and finally the biosphere. This structure shows increasing complexity, with each level building upon the smaller units below it.
Step-by-step explanation:
Hierarchy of the Human Body
The human body is organized into several levels of increasing complexity. At the most basic level, we start with atoms, which are the building blocks of matter. Atoms combine to form molecules, such as water molecules. Molecules in turn combine to form cellular organelles, which are the specialized structures within cells. Cells themselves are the basic unit of life and when similar cells group together, they form tissues. Different tissues then combine to make up an organ. Multiple organs work together as an organ system, and a collection of organ systems forms an entire human organism. Finally, in the wider environmental context, organisms interact within a biosphere, which encompasses all ecosystems.
Therefore, the hierarchy from smallest to largest would be: atom, molecule, organelle, cell, tissue, organ, organ system, organism, and biosphere.
For example, a hydrogen atom is part of a water molecule, which would be found inside a skin cell. That cell is part of the skin tissue, which is an organ, and the skin is one of the organs in the integumentary system. An individual with all their organ systems intact is an organism, and many organisms including humans coexist within the tropical rainforest that is part of the planet's biosphere.