4.1/4.2

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Across
  1. 1. to move very quickly
  2. 5. a usually pleasant smell
  3. 7. not straight
  4. 8. afraid or nervous about what may happen
  5. 10. web a system of interconnected food chains
  6. 12. wanting to learn or know more
  7. 13. something that has a terrible effect or result
  8. 14. something you are naturally better at than others
  9. 15. all of the living organisms, their physical environment, and their interrelationships in a particular place
  10. 16. the people who watch, read, or listen to something
  11. 18. a group of people or other living things in the same area, or having similar traits
  12. 19. moving in a smooth way
Down
  1. 2. to give extra (things) to someone; having extra
  2. 3. a person who is older — usually plural
  3. 4. feeling like you did something wrong or foolish
  4. 5. to express regret or say sorry
  5. 6. a feeling or belief that you can do something well
  6. 9. having what an organism needs to be healthy
  7. 11. a person who helps someone
  8. 17. to stop someone while doing something