Woon crossword

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Across
  1. 6. an environment
  2. 8. a branch of science
Down
  1. 1. the study of living organisms
  2. 2. is a person who studies or an expert of knowledge
  3. 3. is a resistance what moves over another
  4. 4. a systematic study of the structure which we are doing now
  5. 5. a moon phases
  6. 7. is a planet that we live on