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| Read each sentence and identify the word/phrase that you believe correctly completes the statement. Then, click on the arrow to see if your answer is correct. 1. is the study of how organisms interact with each other and with their environment. 2. The things that organisms need to survive and reproduce, such as food, water, and space, are called . A is one whose short supply prevents the growth of a population. 3. is what happens when there are not enough resources to go around. 4. occurs when a superior competitor eliminates another species from the community. 5. occurs when two species avoid competition by sharing a resource. 6. The of a species is its precise role in the community: its diet, habitat, and other aspects of its lifestyle. 7. occurs when organisms eat other organisms. Carnivores are animals that eat , and herbivores are organisms that eat . 8. is the living together of different organisms. In , one organism benefits without harming the host. In parasitism, . In , both partners benefit. 9. From the point of view of food, or , relationships, a community can be divided into , which make food by photosynthesis, and consumers, which . Energy and materials flow from one level to another up the . 10. On an average, about % of the energy and contained in a given trophic level is passed to the next higher level. 11. Microorganisms that break down non-living organic matter are called . Together with the organic matter, they make up . 12. is the transformation of nitrogen gas into a form that organisms can use. 13. Organisms that live on the bottom are called . Pelagic organisms live in . are organisms that drift in the currents, and nekton are organisms that can swim the currents. |