Many stream organisms need clean water in order to thrive. Which of these
associated ecosystems would most help the water in a stream ecosystem
remain clean?
A. Grassland
B. Cropland
C. Wetland
D. Forest

Answer:c

Explanation:depotion

Answer: Answer these questions for an answer

Directions: Each of the questions or incomplete statements is followed by five suggested answers or completions.  Select the letter that is the best answer in each case and then fill in the corresponding oval on the answer sheet.

1.    Which of the following has most affected the development of suburbs in the United States in the last 50 years?

(A) popularity of the automobile  

(B) computer technology and the internet  

(C) high-speed transportation  

(D) inexpensive and reliable electrical energy

(E) access to regional airports

2.    What statement best characterizes a feature of the concentric zone model of urban development?

(A) City growth is haphazard following no particular design or predictable formula.

(B) Urban growth conforms to sectors radiating out from the downtown along such transportation routes as bus and train lines.

(C) The city is organized into groupings of specialized activities (e.g., housing districts, shopping areas, port facilities, etc.).

(D) A multi-metropolitan complex is formed by the coalescence of two or more major urban areas.

(E) The central business district (CBD) is the focus of the city’s social, commercial, and civic life.

3.  An “economic base analysis” studies what?

(A) the threshold level of a good

(B) the interaction between city systems

(C) a city’s taxable income

(D) a city’s economic structure  

(E) the cost-benefit differential between varying goods

4.  Which best describes edge cities?

(A) Along freeways outside of major cities.

(B) Usually found in Europe and Asia.

(C) Small, isolated communities.

(D) Built in the Beautiful City tradition.

(E) Gentrified neighborhoods.

9.  What does the term “empty-nester” refer to?

(A) couples who never had children at all  

(B) the term “empty-nester” is a totally made up word that refers to absolutely nothing

(C) suburban families whose children no longer live at home

(D) the constriction of the suburbs leaving the metaphorical nest in the hinterlands empty

(E) a central city area that has been abandoned and left to poor residents

10.  Which of the following is a correct statement about the major cities of the world?

(A)  They are concentrated between the tropic of Cancer and the Tropic of Capricorn.

(B)  Most are found in areas that are not very suitable for agriculture.

(C)  Most primate cities are located in the United States and western Europe.

(D)  Most are located on rivers or seacoasts.

(E) The world’s fastest-growing cities are  

     found in areas with the highest standards  

     of living.

11.  Which of the following has greatly impacted Eastern European cities over the past 100 years?

(A) the market mechanism

(B) the lack of large residential housing

(C) democracy

(D) communism

(E) the need for a strong central business district (CBD)

12.  Zoning regulations serve all of the following legitimate purposes EXCEPT to

(A)  provide for the creation of certain public uses, such as transportation.

(B)  provide for the creation in appropriate locations of government buildings.  

characteristics.

(C)  exclude undesirable land uses, such as waste disposal sites, from residential areas.

(D)  ensure homogeneity of ethnicity in keeping with already existing neighborhood  

(E)  provide land for certain private uses, such a shopping centers.

17.  Today, most of the United States and Canadian populatio1n lives in which of the following?

(A) Farming areas

(B) Rural nonfarming areas

(C) Central cities

(D) Metropolitan areas

(E) Small towns

18.  Historically, the growth of North American suburbs was most constrained by

(A) high land values.

(B) limited transportation.

(C) zoning ordinances.

(D) housing shortages.

(E) cultural preferences.