Bio, graph, ology

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Across
  1. 2. broken down by living organisms
  2. 3. a collection of sentences about one topic
  3. 5. study of ancient myths and religions
  4. 6. the written story of someone's life
  5. 7. the study of living plants and animals
Down
  1. 1. the signature of someone's name
  2. 2. the written list of books used for research
  3. 4. the study of the earth