Biology chapter 3

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Across
  1. 2. web -The nutritional relationships between populations in an ecosystem involving overlapping food chains.
  2. 4. -The community of organisms in a particular area along with the physical characteristics of their environment.
  3. 5. -A symbiotic relationship in which two organisms share the same habitat without directly affecting each other.
  4. 6. -A group of organisms of the same species living and interacting within the same geographic area.
  5. 9. -A symbiotic relationship between two organisms that benefits both organisms involved.
  6. 11. -A symbiotic relationship between two organisms that is injurious to one organism without affecting the other organism.
  7. 12. -Living or derived from living things.
  8. 15. -Small particles of dead organic material.
  9. 16. -Nonliving; not derived from living things.
  10. 19. -The study of the interrelationships between living things and their physical environments.
  11. 20. -The conflict that results when organisms attempt to use the same resources.
  12. 22. -The role of an organism within its habitat.
  13. 23. -The interaction between two different organisms within an ecosystem.
  14. 24. pyramid -A model for showing the flow of energy through the various trophic levels within an ecosystem from producers to topelevel consumers.
Down
  1. 1. -An autotrophic organism, that is, one that can produce its own food from light or chemical energy.
  2. 3. -A symbiotic relationship between two organisms that benefits one organism without helping or harming the other organism.
  3. 7. -The physical portion of an ecosystem preferred by an organism.
  4. 8. -A measurement of the variety of life in a particular ecosystem.
  5. 10. zonation -Changes in the plant and animal communities within a biome due to changes in elevation that produce differences in light, precipitation, and temperature.
  6. 13. -A heterotrophic organism, that is, one that can not produce its own food and must obtain energy by consuming other organisms.
  7. 14. -An organism that breaks down dead organic material, recycling nutrients to be used by other organisms.
  8. 17. -The sum of all the habitable ecosystems on the earth.
  9. 18. -A symbiotic relationship between two organisms in which one organism benefits at the expense of the other organism, known as the host.
  10. 21. -The set of plants and animals that are adapted for life in those parts of Earth characterized by a particular climate.