Refer to the Graph, Which Is from Tilman's Study on Species

question 178

Multiple Choice

Refer to the graph, which is from Tilman's study on species diversity and community function in grassland ecosystems.It shows the change in efficiency of nitrogen use correlated with number of species in a community. Based on the graph, one can conclude that as species richness increases,

• A) nitrogen use decreases and nitrogen soil content increases.
• B) nitrogen use increases and nitrogen soil content decreases.
• C) both nitrogen use and nitrogen soil content increase.
• D) both nitrogen use and nitrogen soil content decrease.
• E) nitrogen use appears to decline but individual points show it is random.

Describe the influence of activists and reform movements on Native American welfare and U.S. policies.

Comprehend the significance of railroads and technology in facilitating Western expansion and economic growth.

Identify the beginning and development of conservation movements in the U.S.

Examine the changes in societal attitudes toward Native Americans and their cultures over time.

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