The human body is composed of various levels of organization, starting from the smallest particles of matter and progressing to more complex structures. To understand this complexity, it is important to study the body from its simplest components to the whole organism.
At the atomic level, atoms are the smallest particles that retain the chemical properties of the element they belong to. These atoms, known as bioelements, make up living matter. They are composed of subatomic particles such as protons, neutrons, and electrons. The most abundant bioelements are carbon (C), hydrogen (H), 
the oxygen (O), the nitrogen (N), the phosphorus (P) and sulfur (S), which make up 96% of living matter.
Atoms then combine to form molecules, which are more complex structures. These molecules, called biomolecules, can be inorganic or organic. Inorganic biomolecules, such as water and mineral salts, are present in both living and non-living matter. Organic biomolecules, such as carbohydrates, lipids, proteins, and nucleic acids, are exclusive to living things.
Molecules then come together to form macromolecules, and these macromolecules then form cellular organelles. The cell is the basic unit of all living things, and it is composed of these organelles and molecules. The cell is able to perform vital functions such as nutrition, reproduction, and interaction.
Tissues are made up of specialized cells with the same structure and function. These tissues then form organs, which have specific functions such as pumping blood or filtering waste. Multiple organs then work together to form organ systems, which have overall functions like digestion or respiration. All of these levels of organization come together to form the organism, which is able to survive and reproduce. At the ecological level, organisms interact with each other and their environment to form larger ecosystems.
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