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Levels of Organization • Cell—Basic unit of structure and function in organisms. • Some organisms, like bacteria and protists, are unicellular (made entirely of one cell). • Some organisms, like fungi, plants, and animals, are multicellular (made of many cells). • Bacteria have prokaryotic cells. • Protists, Fungi, Plants, and Animals have eukaryotic cells. • In multicellular organisms, cells exhibit cell specialization. They take on specific jobs and look different from each other. • The cells also exhibit division of labor. They split up the work of the organism. Levels of Organization • Tissues—Groups of similar cells that work together to perform a specific function. • 4 major tissue types in animals • • • • Epithelial tissue Connective tissue Muscle tissue Nervous tissue Levels of Organization • Organs—structures made of different types of tissues that work together to perform a specific function. • Examples • • • • • • • • • • Heart Lungs Stomach Small intestine Liver Large Intestine Gall Bladder Plant Roots Plant Stems Plant Leaves Levels of Organization • Organ Systems—Groups of organs that work together to perform a specific function. • Examples: • • • • • • • • Digestive system Circulatory system Respiratory system Nervous system Muscular system Skeletal system Integumentary system (skin) Vascular system in plants Levels of Organization • Organism—A complete, individual living thing. • Examples: • • • • A single person A single plant A single bacterium A single protist Levels of Organization