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E. Never occur in nature
13. Tropical rain forests are considered to have high net primary productivity because of the:
A. Rapid rate at which solar energy is converted to biomass
B. Ability of the soils to hold water
C. Alkaline soils
D. Rapid rate at which biomass decomposes
E. Rapid pace at which organisms reproduce
14. Which of the following greenhouse gases are most abundant?
A. Carbon dioxide, water vapor, and methane
B. Carbon monoxide and methane
C. Methane, water vapor, and sulfur dioxide
D. Sulfur dioxide and nitrous oxide
E. Carbon dioxide and sulfur dioxide
15. Which of the following best describes the process of photosynthesis?
A. Oxygen, water, and solar energy are used to produce carbon dioxide and sugar.
B. Oxygen, sugar, and solar energy are used to produce carbon dioxide and water.
C. Carbon dioxide, water, and solar energy are used to produce oxygen and sugar.
D. Carbon dioxide and oxygen combine to form water and sugar.
E. Carbon dioxide and water are used to produce oxygen, sugar, and more carbon dioxide.
16. The Monteverde golden toad was in danger of extinction with minimal environmental change because
it was __________ to the Monteverde cloud forest.
A. indigenous
B. endemic
C. native
D. introduced
E. extirpated
17. Which of the following can be considered a keystone species?
A. Garter snake
B. Mosquito
C. Poison oak
D. Barn owl
E. Beaver
Questions 18-20 refer to the following answer choices.
A. Tundra
B. Chaparral
C. Boreal forest
D. Desert
E. Temperate grassland
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