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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
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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
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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:
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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:
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A single person
A single plant
A single bacterium
A single protist
Levels of Organization
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