- Study guides, Class notes & Summaries

1. Be able to list organization amongst living things - from the smallest unit (atom) up through biosphere (largest). -Atom: smallest unit of an element: protons, electrons and neutrons -Molecule: two or more atoms combined -Cell: structural and functional unit of all living organisms -Tissue: a group of cells with a common structure and function -Organ: composed of tissues functioning together for a specific task – i.e. a heart -Organ System: Composed of several organs working togethe...