biology puzzle

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Across
  1. 1. the study of heredity and variation in organisms
  2. 4. the region of the body between the thorax and the pelvis
  3. 7. a threadlike strand of DNA that carries genes
Down
  1. 2. organisms interacting with their physical environment
  2. 3. part of DNA controlling physical characteristics and growth
  3. 5. the process by which a cell divides into two smaller cells
  4. 6. a part of the cell responsible for growth and reproduction