the words

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Across
  1. 2. brother/twin sister two identical children in the family
  2. 3. a set of animals or plants
  3. 8. used for saying
  4. 11. to put something in a place
  5. 12. a member of your family
  6. 14. he same in a lot of places or for a lot of people
  7. 15. much more than usual
  8. 16. to agree with and give encouragement to someone
Down
  1. 1. a body divided into three parts
  2. 3. the material on the surface of the ground
  3. 4. relating to science
  4. 5. best friend
  5. 6. has many things the same
  6. 7. to contain something as a part of something else
  7. 9. learn about something
  8. 10. relating to people
  9. 13. they take air into their lungs and let it out again.