Which of the following statements is true about tree plantations?
A. Tree plantations decrease overall forest biodiversity.
B. Tree plantations increase overall forest biodiversity.
C. The majority of tree plantations in the U.S. have been replaced by old-growth forests.
D. Tree plantations are best established on land that has not been degraded.
E. More tree plantations in the U.S. will lead the way for more biologically diverse primary growth forests.
Answer: A
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A) nitrous oxide B) water vapor C) sulfate aerosols D) methane
In the language of the food chain, herbivorous animals are called ________
A) the apex B) primary consumers C) tertiary consumers D) secondary consumers E) dominant
Geologic evidence suggests that oceans formed by at least ____
A)200,000 years ago B)4.6 million years ago C)2.4 billion years ago D)3.5 billion years ago E)4.6 billion years ago
How is a pothole formed?
A. Through deposition of sand on the inside curve of a meander B. By the saltation of individual sand grains on a muddy stream bed C. Because of the chemical weathering of rocky banks by acidic river water D. Through the swirling, scouring action of pebbles on a hard stream bed E. Through erosion of a muddy bank on the outside curve of a meander