biology

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Across
  1. 2. the study of genes and heredity
  2. 3. the study of organisms inner structures
  3. 5. the basic unit of heredity
  4. 6. the basic unit of life
  5. 8. the study of animals
  6. 9. the study of animal behavior
  7. 10. the study of plants
Down
  1. 1. the study of microorganisms
  2. 4. the study of human beings
  3. 7. the engine that propels the creation and extinction of species