Living Environment Review

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Across
  1. 9. the destruction of an organism, or the removal of an organism from its habitat
  2. 11. a balance that measures mass automatically
  3. 12. the study of how living things interact with one another and with their environment
  4. 13. the process that transforms developing cells into specialized cells with different structures and functions
  5. 15. the process of obtaining oxygen from the environment and releasing carbon dioxide
  6. 18. the disease that results when the HIV virus attacks the human immune system
  7. 19. combination of all the different populations that live and interact in the same environment
  8. 21. the additional mixing of genetic material from sperm and egg which results in a unique combination of genes
  9. 22. specialized cells that control the opening and closing of the pores on the surface of a leaf
  10. 23. guide that compares pairs of observable traits to help the user identify an organism
  11. 26. one of the tiny structures in the cell that is the site of protein production
  12. 28. a chemical used to make cell structures more visible when viewed under a microscope
  13. 29. certain protein molecules in the cell membrane that can receive chemical messages from other cells
  14. 31. a substance made of weakened, killed, or partial pathogens and designed to protect the body from future invasions of that blood pathogen
  15. 32. a collection of fossils used to represents the Earths history
  16. 35. the bodys ability to destroy pathogens before they cause disease
  17. 36. the process by which an existing community is replaced by another community
  18. 39. an organism that survives by living and feeding on other organisms
  19. 40. the first groups of communities that moves into a previously lifeless habitat
  20. 43. he part of an experiment that is changed to test a hypothesis
  21. 47. a protein, produced by the immune system, that either attacks invading pathogens or marks them for killings
  22. 49. the bodys primary defense against disease-causing pathogens
  23. 50. a unit of length equal to one millionth of a meter
  24. 51. the first organisms to become established in a new habitat
Down
  1. 1. the combination of technology and biological sciences
  2. 2. any trait that helps an organism survive and reproduce under a given set of environmental conditions
  3. 3. a kind of water pollution in which the temperature of the water increases
  4. 4. the formation of a new combination of genes during sexual reproduction
  5. 5. the removal of all the wastes produced by the cells of the body
  6. 6. the curved surface at the top of a column of liquid
  7. 7. several organs that work together to perform a major function in the body
  8. 8. a factor that might influence the dependent variable in an experiment
  9. 10. Earths history as revealed by layers of rock
  10. 14. a cycle in which the output of a system either modifies or reinforces the first action taken by the system
  11. 16. a compound that contains both hydrogen and carbon
  12. 17. a hormone associated with sexual development and the reproductive system
  13. 20. a chemical process that in a living thing
  14. 24. an exchange or agreement made to reach a compromise
  15. 25. the act of cutting apart a dead organism to examine its internal structure
  16. 27. a hormone that prompts glucose to move from the blood into body cells, resulting in a lower glucose level in the blood
  17. 30. the flow of materials within a cell as well as between parts of a multicellular organism
  18. 33. a substance that can speed up the rate of a chemical reaction without being changed or used up during the reaction
  19. 34. tiny pores found on the underside of most leaves
  20. 37. any change in the environment that causes an organism to react
  21. 38. the process by which the chemical bond energy stored in nutrients is released for use in cells
  22. 41. the passing of traits from parents to offspring
  23. 42. all the chemical reactions that occur within the cells of an organism
  24. 44. a molecule found on the outer surfaces of cells that the immune system recognizes as either part of the body or an outside invader
  25. 45. any microscopic organism
  26. 46. the organism in a parasitic relationship that provides a home and/or food for the parasite
  27. 48. an organism that invades the body, causing disease