Valentines for Science

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