Bio Ch 2

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Across
  1. 4. step in a food chain or web
  2. 7. a chemical substance that an organism must obtain from its environment
  3. 11. where an organism lives
  4. 12. a group of interacting populations that occupy the same geographic area at the same time
  5. 13. the scientific discipline in which the relationships among living organisms and the interactions the organisms have with their environments are studied
  6. 17. a model representing the many interconnected food chains and pathyways in which energy flows through a group of organisms
  7. 18. a heterotroph that eats both plants and animals
  8. 22. the close relationship that forms when two or more species live together
  9. 26. an organism which eat fragments of dead matter in an ecosystem and returns nutrients to the environment
  10. 27. a relationship where one organism benefits at the expense of another
  11. 28. the exchange of matter through the biosphere
  12. 30. a heterotroph that only eats plants
  13. 31. nonliving
  14. 32. the process by which oxygen is exchanged between the earth and its atmosphere.
  15. 34. the portion of Earth that supports life
  16. 35. individual organisms of a single species that share the same geographic location at the same time
  17. 36. the act of one organism consuming an other organism for food
Down
  1. 1. a role or position that an organism has in its environment
  2. 2. the conversion by bacteria of fixed nitrogen compounds to nitrogen gas
  3. 3. the movement of phosphorous atoms from rocks through the biosphere and hydrosphere and back to rocks
  4. 5. a large group of ecosystems that share the same climate and have similar types of communities
  5. 6. the process of capturing and converting nitrogen into a form that is usable by plants
  6. 8. anything that has mass and takes up space
  7. 9. The continuous circulation of water between the Earth's surface and the atmosphere; evaporation, condensation, precipitation
  8. 10. a relationship between two or more organisms that live closely together and benefit from each other
  9. 14. the total mass of living matter at a trophic level
  10. 15. a relationship where one organism benefits and the other is neither hurt nor helped
  11. 16. the movement of carbon from the nonliving environment into living things and back
  12. 19. a biological commuunity and all of the biotic and abiotic factors that affect it
  13. 20. an organism that collects energy from sunlight or inorganic substances to produce food
  14. 21. the cycling of nitrogen between organisms, soil, water, and the atmosphere
  15. 23. A carnivore that feeds on the bodies of dead organisms
  16. 24. a simple model that shows how energy flows through an ecosystem
  17. 25. living
  18. 29. an organism that gets its energy requirements from consuming other organisms
  19. 33. a heterotroph that preys on other heterotrophs