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Across
  1. 2. The theory of ______ was popularized by Charles Darwin
  2. 4. measure of genes carried to the next generation by an individual
  3. 7. Something that causes a specific response
  4. 9. signal Conveying accurate information about some aspect of the signaler's quality
  5. 10. A neurotransmitter that mediates satisfaction
Down
  1. 1. the processes of attracting a mate
  2. 3. A trait that helps increase an individuals fitness
  3. 5. Ducklings do this to the first animal they see when hatched
  4. 6. self-sacrificing behavior to benefit another organism
  5. 7. gazelles do this when predators are nears
  6. 8. killing offspring of the same species, usually done by males