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8 Levels of Organization Living organisms are divided into eight levels of organization in order for scientists to study problems on several different levels This slideshow displays the levels of organization from smallest to largest. Atom Fundamental units of matter. Molecule Combinations of atoms in specific arrangements. Ex. proteins, carbohydrates, DNA, water Organelle Structures found in cells with specific functions. Ex. nucleus, mitochondria, golgi body Cell The smallest unit of living things. Ex. Single celled organisms like bacteria or Types of cells within multicellular organisms i.e. liver cells, nerve cells, white blood cells Tissue Clusters of cells that work together to perform a function in an organism. Ex. muscle tissue, blood, liver tissue Organ A group of tissues that perform a function Ex. An eye contains many kinds of tissue working together. i.e. blood vessels, pigment tissuse, connective tissue, etc. Organ System A group of organs that perform a function Ex. The circulatory system is composed of veins, capillaries, arteries, and the heart. All these organs move blood. Organism An independent living unit. Ex. blue whale, you, mushroom, amoeba