Block 1 Crossword Puzzle

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Across
  1. 3. Living things grow by cell ___.
  2. 5. Many cells.
  3. 8. All living things need a constant supply of ___.
  4. 9. The organ that's responsible for your breathing.
  5. 13. One cell.
  6. 15. A group of cells.
  7. 16. The number of cells in the human body is 50 ___.
  8. 17. A group of tissues.
Down
  1. 1. Stable internal condition.
  2. 2. An organ.
  3. 4. A type of cell.
  4. 6. All living things ___.
  5. 7. The last step in the scientific method.
  6. 8. Organisms change over time.
  7. 10. The basic unit of life.
  8. 11. 100 cm equals 1 ___.
  9. 12. A type of reproduction.
  10. 14. The study of the interactions of organisms.