Essential features of a living organism: grow, maintain oneself and reproduce. Process of growing, maintaining and reproducing: have a source of energy, must be able to get raw materials from their environment. Ex) building materials: carbohydrates: have a plan for how to use the raw materials and energy to make the component of their bodies. Key components/ingredients of all living organisms: building supply, energy source, plan. Reasons why cells are the fundamental unit of life (cell theory): It is the simplest unit of life capable of independent existence and reproduction: all organisms are composed of 1+ cells. Influence of dna: goes beyond the nucleus and all cellular activity. Organization of cells: small and large molecules. Macromolecules in the living tissue of the human body (minus bone from biggest to. Very important molecule: (small), h2o: water smallest: water. Components of organization in cells: water, collection of macromolecules and water.