BI 14 Hierarchy, Body Systems, Cells

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Across
  1. 4. system that transports needed substances to body cells and carries away waste
  2. 6. smallest unit of life
  3. 7. system protects body against disease and infections
  4. 10. large in plants and small in animal cells. Stores things
  5. 11. outer layer of plant cells. Animal cells don't have one
  6. 12. controls cell, contains DNA
  7. 13. collection of tissues working together
  8. 14. group of atoms bonded together
  9. 15. jelly-like stuff inside cells
  10. 16. organs that work together to perform a function
  11. 18. system that digests and breaks down food and absorbs nutrients
  12. 19. system allows movement, helps respond, protects internal organs, blood cells produced in bones
  13. 20. system that exchanges gases, oxygen and carbon dioxide
Down
  1. 1. group of similar cells to perform a function
  2. 2. structures within a cell with specific functions
  3. 3. smallest unit of matter
  4. 4. occurs in all cells. lets things in and out of the cell
  5. 5. system sends signals between body and cells, responds to environment
  6. 8. system cleans the blood and makes urine
  7. 9. exist only in plant cells. Allows them to make their own food
  8. 16. living thing that carries out basic life functions
  9. 17. provides energy for both plant and animal cells