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The Diversity of Cellular Life on Earth

Explore the fascinating world of unicellular and multicellular organisms, from single-celled powerhouses to specialized cells that form tissues and organs. Learn about cell specialization, examples of animal and plant cells, and the levels of organization within multicellular organisms.

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The Diversity of Cellular Life on Earth

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  1. 7-4 The Diversity of Cellular Life Earth – The Living Planet

  2. Unicellular Organisms • A single celled organism can do everything that you would expect a living thing to do. • They grow, respond to the environment, transform energy, and reproduce. • Unicellular organisms dominate the earth.

  3. Multicellular Organisms • Cells throughout an organism can develop in different ways to perform different tasks. • This is call cell specialization. • Examples of specialized animal cells include: • Red blood cells • Muscle cells • Pancreatic cells

  4. Specialized Plant Cells • Examples of specialized plant cells include: • Stomata • Guard cells

  5. Levels of Organization • The levels of organization in a multicellular organism are; • Individual cells • Tissues – group of similar cells that perform a particular function • Organs – group of tissues that work together • Organ systems – a group of organs that work together to perform a specific function

  6. Levels of Organization Example • Individual cell – muscle cells • Tissue – smooth muscle tissue • Organ – stomach • Organ system – the digestive system

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