The best crossword ever

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Across
  1. 1. The specific environment in which an organism resides
  2. 6. Models scientists use to show the age structure of populations
  3. 7. Factors of the environment that are living or used to be living
  4. 8. The number contrast between males and females
  5. 11. The amount of separate organisms living in a population at a given time
  6. 12. The number of individuals within a population
  7. 13. The study of an organisms interaction with their own species, other species, and their environment
  8. 15. The number of organisms in a species that live in the same area at the same time
  9. 16. A group of individuals that interbreed and produce fertile offspring to survive
Down
  1. 2. The amount of organisms of each age living in a population
  2. 3. Anything that an organism needs to survive and reproduce
  3. 4. How organisms are distributed within an area
  4. 5. All of the populations in a particular place
  5. 9. All living organisms in their physical environments within a particular boundary
  6. 10. Factors of their environment that have never been living
  7. 14. All parts of earth that host life with all of its organisms and environments