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Across
  1. 3. most active during the day
  2. 4. multiple rhythms that must occur simultaneously
  3. 6. activity linked to high and low tide
  4. 7. activity linked moon phases
  5. 8. most active at night
Down
  1. 1. most active at dusk and dawn
  2. 2. a rhythm that lasts approximately 1 year under constant environmental conditions
  3. 5. a rhythm that lasts approximately 24 hours under constant environmental conditions