Biologists Crossword

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Across
  1. 4. known as "survival of the fittest"
  2. 5. transfer of what?
  3. 7. studies microbes
  4. 8. you're a form of this
Down
  1. 1. what is biology the study of?
  2. 2. what kind of scientists are they?
  3. 3. a branch of biology that deals with heredity
  4. 6. only visible under a microscope