Across
- 3. male and female penguins mate for life
- 4. a courtship behavior in humans
- 5. the ingestion of food and nutrients
- 6. heart palpitations
- 9. a treat made from a simple carbohydrate
- 10. XX friend
- 12. a vertebrate with feathers
- 14. organ that is part of the circulatory system
- 15. often contain He
- 17. made from the seeds of a tree
- 18. colorful angiosperms
- 20. a behavior used to attract a mate
Down
- 1. has evolved a smell that attracts bees
- 2. bees and flowers have a symbiotic one
- 7. the R in ROYGBIV
- 8. XY friend
- 11. made from the element "carbon"
- 13. made from the process of fermentation
- 16. a biological emotion that keeps species alive
- 17. made from the lipid byproduct of a beehive
- 19. a behavior that signals that you are partners