Levels of Cellular Organization

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Across
  1. 2. The millions of tiny air sacs that the lungs are made up of
  2. 5. The activity of each part in an organism
  3. 6. The arrangement of parts in an organism or an object
  4. 7. A group of organs that work together to perform body functions
  5. 8. A structure made up of a collection of tissues that carries out a specialized function
  6. 9. A group of similar cells that perform a common function
Down
  1. 1. Organisms that are made up of just one cell that performs all of the functions necessary for life
  2. 3. A living thing that can carry out life processes by itself
  3. 4. Organisms made up of more than one cell