PUSHING BOUNDARIES R&W

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Across
  1. 3. Has a trunk
  2. 5. a theory or set of theories about something
  3. 6. Likes to chase mice
  4. 7. of fibers that carry brain signals between neurons
  5. 9. Man's best friend
Down
  1. 1. of an activity; something that stops you from continuing in the normal way
  2. 2. Flying mammal
  3. 4. work together
  4. 8. Large marsupial