7a

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Across
  1. 4. Inference that if two or more things agree with one another
  2. 5. Complicated
  3. 7. Consisting of or existing in two corresponding or identical parts
  4. 8. A formal justification
  5. 11. Making difficult
  6. 12. A collection of selected literary pieces or passages
  7. 13. Being or relating to a system of transmitting several messages
  8. 15. A concluding section that rounds out the design of literary work
Down
  1. 1. The preface or introduction to a literary work
  2. 2. The act or process of multiplying
  3. 3. The totality or pattern of relations between organisms
  4. 4. The act of applying
  5. 6. Filled with uncertainty
  6. 9. To increase in number especially greatly
  7. 10. One associated with another especially in wrong doing
  8. 14. A structural material