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2. Organisms that are able to make their own food.

3. Producers

4. Both the living and non-living things in an environment along with the interactions among them.

5. Ecosystem

6. Diagram that shows the interconnected network of food chains within a ecosystem.

7. Food Web

8. An estimate of the biological mass in an ecosystem.

9. Biomass

10. Process by which viruses reproduce.

11. Viral replication

12. Organisms that must eat other organisms to obtain food.

13. Consumer

14. Diagram that shows the energy loss among the trophic levels in an ecosystem.

15. Energy pyramid

16. The continuous movement of water through the environment and living things.

17. Water cycle

18. Any trait that improves an organism’s chance for survival and reproduction.

19. Adaptation

20. Term for all the interacting populations of organisms that share an ecosystem.

21. Community

22. Each feeding level in an ecosystem.

23. Trophic Level

24. A medicine that contains dead or weakened forms of a pathogen.

25. Vaccine

26. Primary consumers that feed only on plants.

27. Herbivores

28. An organism that lives on or in another organism.

29. Parasite

30. Single-celled prokaryotes that can be controlled by using antibiotics. (Most numerous organisms on earth)

31. Bacteria

32. Occurs when there are no longer any living members of a species on earth.

33. Extinction

34. Environmental conditions that limit the size of a population.

35. Limiting factors

36. A symbiotic relationship in which one organism benefits and the other neither benefits or is harmed.

37. Commensalism

38. The organism that is affected by a parasite.

39. Host

40. All the members of a species that live in the same area at the same time.

41. Population

42. Secondary & tertiary consumers that feed only on animals.

43. Carnivores

44. Body parts that have a similar function, but not a similar structure.

45. Analogous structures

46. Vascular tissue that carries food down to other plant structures.

47. Phloem

48. Process by which species of organisms change over time.

49. Evolution

50. Scientific theory that explains the process of evolution.

51. Natural Selection