Two objects move toward each other because of gravity. As the objects get closer and closer, the force between them
A) increases.
B) decreases.
C) remains constant.
A
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If a population of species in an ecosystem does not fluctuate much over time, the ecosystem
A) has no significant buffering mechanisms. B) has many "eury" species. C) is said to be stable. D) has low inertia.
Summertime high pressure systems
A) can cause drought. B) often stay relatively stationary for a week or more at a time. C) contributed to the death of John F. Kennedy, Jr. D) do not have large horizontal temperature gradients. E) all of the above
Which of the following are examples of regulating ecosystem services?
A) Soil formation and nutrient cycles B) Food, water, and fiber C) Pollination and chlorophyll D) Climate, water flow, and disease control E) Aesthetic beauty and recreation
What conclusions can you make from examining the graph? 
A. Ecosystem "c" is used by humans about twice as much as ecosystem "d". B. Ecosystem "a" has the most threatened plant species. C. Ecosystem "a" has the most biodiversity. D. Humans use ecosystem "a" much more than ecosystem "b". E. None of these conclusions is supported by the data.