Animal behaviour

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Across
  1. 4. orientation resulting from change in the rate of activity
  2. 6. recording showing how level of animal activity changes over time
  3. 7. having an external origin
  4. 9. active at night
  5. 10. period of greatly reduced activity in anticipation of winter
  6. 11. having an internal origin
  7. 13. physical or non-living environmental factor
  8. 14. a movement towards ot away from a stimulus
Down
  1. 1. the sum total of an organism's requirements.Its way of life
  2. 2. duration of one complete cycle of a rhythm
  3. 3. rhythm which under constant environmental condition has a period of about a day
  4. 5. a rhythmic environmental cue that resets an internal clock
  5. 8. resetting an internal clock by a rhythmic environmental cue
  6. 10. the place where an organism lives
  7. 12. a change in an organism's environment to which it can respond