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Levels of Organization All living things have a structure that is based on specific organization of materials (chemicals). Example Level of organization oxygen, nitrogen, gold atom water, carbon dioxide molecule proteins, lipids, carbohydrates mitochondria, nucleus, golgi apparatus Explanation the smallest particle of an element having the same physical and chemical properties Smallest particle of compound--when two or more atoms are bonded together macromolecule when two or more molecules are bonded together to form large (gigantic!) molecules organelles several macromolecules bonded together form tiny structures of a cell Below this level begins what scientists consider living or alive Bel bacteria, animal, plant epithelial, connective cells tissues the smallest unit of life, a cell is a collection of organelles functioning together a collections of cells working together to perform a specific job two or more types of tissues that work together to complete a specific task heart, stomach, brain organs digestive, cardiovascular, respiratory organ systems (systems) several organs working in unison to achieve a common goal several organ systems functioning together human, dog, tree organism bees, ants population all of the human species community wetlands, oak forest ecosystem desert, trundra, rainforest groups of individual organisms of the same species working together to achieve a common goal populations of different species of organisms groups of different populations living in the same environment a collection of ecosystems with similar climates biome the earth's living occupants all of the biomes on the planet earth biosphere