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Across
  1. 3. happening every evening/night
  2. 5. an occasion when a business or large piece of equipment stops operating, usually for a temporary period.
  3. 7. evolution the same features have developed in different species.
  4. 9. having no connection
Down
  1. 1. something tasty to eat
  2. 2. a way of influencing behavior through rewards and punishments
  3. 4. from to have developed from something that existed in the past
  4. 6. a pet that no longer has a home or cannot find its home
  5. 8. in a way that happens, is done, or is chosen by chance rather than following any system, plan, or rule.