Which of the following activities have contributed the greatest amount of carbon dioxide to the atmosphere over the past 100 years?
A) Increased farming and production of grains
B) Increased reliance upon coal, oil, and natural gas
C) Deforestation of rain forests and other parts of the world
D) Volcanic eruptions and widespread forest fires
Question 2
Which of the following would most likely have the greatest impact on a large ecosystem?
A) loss of several keystone species from the ecosystem.
B) construction of a two-lane gravel road through the middle of the ecosystem.
C) construction of a lodge and trails to permit better access for ecotourists.
D) allow the ecosystem to burn on a natural cycle.
Water amount needed to grow crops
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