1. What is the term for a cold forest made up of pine trees and other conifers?

2. A wealthy landowner is tired of all the flies that live in the area around his home, and he considers importing a foreign species of frog to eat the flies. Is this a good idea?

3. What happens to the steam after it passes by the turbine?

4. Which of the following best describes a healthy ecosystem?

5. What is the term for all the organisms of one species in a particular ecosystem?

6. Besides chemicals such as nitrogen, what other important quantity is passed between organisms and their environment in a cycle?

7. In the deepest parts of the ocean, too deep for sunlight to reach, are hydrothermal vents that emit hot water filled with chemicals. Some bacteria feed on these chemicals, small crustaceans called copepods eat the bacteria, and snails and fish eat the small crustaceans. Certain deep-sea fungi there may break down dead organisms. Which of the organisms mentioned fulfills an ecological niche most similar to that of plants on land?

8. Which of the following best describes a healthy ecosystem?

9. What happens to the steam after it passes by the turbine?

10. One of the first people recorded to have reached the top of Mount Everest, more than five miles above sea level, was a Nepalese guide named Tenzing Norgay, who left some bars of mint cake on the peak. What direction did the Earth's gravity pull the mint cake?

11. What probably happens to the nitrogen of an organism when it dies?