Ch 2 Biology Study Guide Write your answers to the questions on a separate sheet of paper.

1. An includes the top portion of Earth's crust, all the waters that cover Earth's surface, and the
surrounding atmosphere.
2. A consist of all the organisms living in an area and the nonliving features of their environment.
3. are scientists who study the interactions among organisms and their environment.
4. A refers to all the populations in an ecosystem.
5. A consists of all the organisms in an ecosystem that belong to the same species.
6. The place in which an organism lives is called its .
7. Green plants are producers that use to produce energy-rich molecules.
8. obtain energy by eating other organisms.
9. Plant eaters, like deer and rabbits, are called .
10. Meat eaters, like tigers and frogs, are called .
11. Pigs and humans are examples of , animals that can eat both consumers and producers.
12. Environmental factors in an ecosystem include nonliving, or , factors.
13. Ecology is the scientific discipline that studies all the interactions between
14. What is an abiotic factor?
15. What is an autotroph?
16. Give an example of predation.
17. Which organisms capture atmospheric nitrogen for the process of nitrogen fixation?
18. Give an example of mutualism.
19. Some birds are known as honeyguides because they may be followed by humans to wild beehives. When the humans
take honey from the hives, the birds are able to feast on the honey and bees, too. This type of relationship can best be
described as .

Figure 2-3
20. In the energy pyramid shown in Figure 2-3, which level has the smallest number of organisms?
21. What is the ultimate source of energy for the pyramid in Figure 2-3?
22. What is nitrogen fixation?
23. Some farmers use manure on their crop fields. How does this help the plants?
24. help recycle once-living matter by breaking it down into simple, energy-rich compounds.
25. A is a model of the feeding relationships among organisms in an ecosystem.
26. Consumers that eat both plants and animals are called .
27. An example of a nonliving feature of an environment is .
28. In the relationship between a raccoon and the fish in a stream, the raccoon is .
29. Omnivores, herbivores, carnivores, and decomposers are all types of .
30. The organisms of one species living together in the same place at the same time are a .

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31. The role a species plays within a community is its .
32. The number of individuals in a given area is a .
33. What is a biotic factor?
34. Nitrogen is a necessary ingredient of .
35. What eats consumers?
36. What is a model of feeding relationships?
37. the place in which an organism lives
38. organisms in an ecosystem that belong to one species
39. the study of interactions among organisms and their environment
40. all the organisms living in an area and the nonliving features of their environment
41. how an organism survives in its environment
42. the feeding relationships among the organisms in an ecosystem
43. the part of Earth that supports life
44. all the populations in an ecosystem
45. living ecosystem components
46. a close relationship between species
47. a symbiotic relationship in which one partner benefits but the other is not affected
48. organisms that use an outside energy source to make its own food
49. a symbiotic relationship in which one organism benefits but the other is harmed
50. a symbiotic relationship in which both species benefit
51. organisms that cannot make their own food
52. the feeding relationships among the organisms in an ecosystem

I NEED THE ANSWER TO THESE JUST THE WORD NOT THE QUESTION