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The levels of organization in living systems are as follows, starting from the smallest unit of life:

  1. Cell: A cell is the basic unit of life, and it is the smallest unit that can carry out all the functions of life. All living organisms are composed of at least one cell, and some, like bacteria, are unicellular, meaning they consist of only one cell. Other organisms, such as humans, are multicellular, meaning they are composed of many cells that work together to carry out the functions of life. Examples of cells include red blood cells, muscle cells, and neurons.
  2. Tissue: Tissues are groups of cells that work together to carry out a specific function. Examples of tissues include muscle tissue, nervous tissue, and epithelial tissue.
  3. Organ: Organs are groups of tissues that work together to carry out a specific function. Examples of organs include the heart, lungs, and liver.
  4. Organ System: An organ system is a group of organs that work together to carry out a specific function in the body. Examples of organ systems include the cardiovascular system, the respiratory system, and the nervous system.
  5. Organism: An organism is a complete living thing that can carry out all the functions of life. Examples of organisms include humans, dogs, and plants.

Each level of organization builds upon the previous level, and each level is more complex than the previous one. For example, cells are the basic building blocks of living organisms, and tissues are composed of groups of cells that work together to carry out a specific function. Organs, in turn, are made up of groups of tissues, and organ systems are composed of groups of organs that work together to carry out a specific function in the body. Finally, organisms are composed of multiple organ systems that work together to keep the organism alive and functioning properly.

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