Hierarchy or Organisms

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Across
  1. 3. An organized system in which items are ranked or arranged from simplest to most complex.
  2. 4. A group of organs that work together to perform major body functions, such as the digestive or respiratory system
  3. 7. An individual living thing, such as a plant, animal, or bacterium.
  4. 8. The smallest unit of life; all living organisms are made of one or more cells.
Down
  1. 1. Specialized structures inside a cell that perform specific functions, like the nucleus or mitochondria.
  2. 2. A group of similar cells that work together to perform the same function, such as muscle or nervous tissue.
  3. 4. A structure made of different types of tissues working together to perform a specific job, such as the heart or lungs.
  4. 5. The smallest unit of matter; all substances are made of atoms.
  5. 6. A group of two or more atoms that are chemically bonded together.