Biology

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Across
  1. 3. the study of genes and heredity
  2. 4. the study of human beings
  3. 6. the study of animal behaviour
  4. 7. the study of animals
  5. 8. the study of the immune system
Down
  1. 1. the study of plants
  2. 2. the study of organisms structures
  3. 5. the study of the functions and mechanisms