rhythms, cycles and biological clocks

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Across
  1. 2. shortest season
  2. 4. hormone that makes you sleep
  3. 6. animals that move during the day
  4. 9. part of the brain in mammals to set time
  5. 11. animals that move at dusk or dawn
  6. 13. occurs when you cross time zones
  7. 16. animals that move at night
  8. 17. a set of oscillations that plots time vs body
Down
  1. 1. zeitgeber based on the sun
  2. 3. environmental cue used to set biological clock
  3. 5. caused by the moon gravity
  4. 7. moon rise to moon rise
  5. 8. body part of the brain in birds to detect light
  6. 10. every 29.5 days
  7. 12. where light enters mammals
  8. 14. animal that rely on tidal cycle
  9. 15. longest of the 4 seasons