Which is characteristic of soil horizons?
A. They are classified by letters.
B. They can be distinguished from one another by appearance and chemical composition.
C. Boundaries between soil horizons are usually transitional rather than sharp.
D. All of the preceding
Answer: D
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What will be an ideal response?
Why is the sea otter considered a keystone species in areas of the Pacific Ocean?
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Indicate whether the statement is true or false
Transnational corporations are also called multinational corporations
Indicate whether the statement is true or false.