LEVELS OF BIOLOGICAL ORGANIZATION

• Biological Organization is based on a hierarchy of structural levels.
• Atom is the smallest unit of matter that possesses physical and chemical properties.
• Subatomic particles are the particles (protons, neutrons, and electrons) that compose an atom.
• A molecule consists of two or more atoms that are chemically bonded together.
• Molecules range from small molecules to micro molecules to macromolecules.
• Small molecules are composed of only two atoms.
• Micro molecules are composed of many atoms that function as subunits from where large molecules are built.
• Macro molecules are molecules that made up of many subunits like carbohydrates, proteins, fats, and DNA.
• Organelles are highly organized assemblies of several macromolecules bonded together to perform specific function in the cell.
• A Cell is a collection of organelles that are functioning together.
• The cell is the basic unit of life
• The cell has varied sizes and

  shapes.
• A Tissue is a group of distinct and similar cells that work together to perform specific set of functions.
• An Organ consists of more than one type of tissue, all working together to perform a specific function.
• An Organ System consists of several different organs that work together for a common purpose.
• An Organism is an aggregation of the organ system that work together to bring about various life activities.
• A Population is a group of organisms of the same species that have the same habitat and can reproduce.
• A Community consists of all the populations of different species of organisms living together in an area. These organisms are interacting with one another.
• An Ecosystem consists of all biotic components that inhabit the same area, as well as the abiotic components and set interactions that exist between them.
• A Biome pertains to a collection of ecosystems with similar climates and covering a large geographical area where various ecosystem interact.
• A Biosphere consists of the totality of the ecosystems of planet Earth.