Unit 18 Crossword 1

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Across
  1. 2. process by which two species evolve in response to changes in each other
  2. 5. the act of acting on or in close relation with each other
  3. 7. a strong, wavelike, forward movement, rush, or sweep
  4. 8. a hormone that promotes a feeling of connection, bonding.
  5. 10. a long look at something
Down
  1. 1. make fit for cultivation, domestic life, and service to humans
  2. 3. to bring up, care for, train, nourish;
  3. 4. parts of the brain, that attach to pain receptors and so block pain sensation
  4. 6. to develop gradually; to rise to a higher level
  5. 9. a set of ideas created to explain something