Across
- 3. Time giver.
- 6. Internal control of biological clock.
- 8. The movement of an entire population of a species.
- 9. Awake in daytime, asleep at night time.
- 10. Awake at dusk and down asleep other times.
Down
- 1. hormone that promotes flowering.
- 2. Day length.
- 4. An indicator of seasonal change.
- 5. External influence on biological rhythm.
- 7. Awake at nighttime, asleep in the daytime.