Chapter 19; Natural Systems and Interactions

B 9. B 17. C D 10. A 18. A B 11. C 19. B C 12. D 20.C D 13. A 21. A C 14. B 22. C D 15. A 23.B A 16. A 24. D

25. A 33. Dissolved Oxygen, temp 26. C 34. What it eats determines 27 25. A 33. Dissolved Oxygen, temp 26. C 34. What it eats determines 27. C where it can live 28. A 35.Not enough water limits 29. D how many trees can grow 30. C 36.salt/Temp/sunlight - determine 31. D what food lives there 32. Biotic – living; fish, grass Abiotic – nonliving; rock, soil

37. More resources available 40. Slower increase 41. same habitat = same food; survival of the fittest 42. B

43. B 44. Mouse – grass, grain - water , shelter 45 43. B 44. Mouse – grass, grain - water , shelter 45. Both harm organism, one kills, one usually only harms 46. C 47. D 48. B 49. B 50. flooding