1. 5. an organism that cannot produce its own food, instead taking nutrition from other sources of organic carbon, mainly plant or animal matter
  2. 8. species' average population size in a particular habitat
  3. 10. an organism that can produce its own food using light, water, carbon dioxide, or other chemicals
  4. 11. all food chains in a ecosystem
  5. 12. are adapted and often highly specialized for hunting, with acute senses such as vision, hearing, or smell
  6. 15. the animals predators eat
  7. 17. linear sequence of organisms through which nutrients and energy pass as one organism eats another
  8. 18. the way in which an organism fits into an ecological community
  9. 19. a relationship between individuals of two species in which one species obtains food or other benefits from the other without either harming or benefiting the latter
  10. 20. the ecological interaction between two or more species where each species has a net benefit
  1. 1. the process in which light energy is converted to chemical energy in the form of sugars
  2. 2. living organism that shapes its environment
  3. 3. are vulnerable to endangerment in the near future
  4. 4. animals that may go extinct soon
  5. 6. place were organism makes its home
  6. 7. the regions of the surface, atmosphere, and hydrosphere of the earth occupied by living organisms
  7. 9. basic membrane-bound unit that contains the fundamental molecules of life and of which all living things are composed
  8. 13. factors non-living chemical and physical parts of the environment that affect living organisms and the functioning of ecosystems
  9. 14. the branch of biology that deals with the relations of organisms to one another and to their physical surroundings
  10. 16. the relationship between different species in which one organism lives on or in the other organism and benefits from it by causing some harm