Barriers to migration include all EXCEPT
A) physical barriers.
B) motivational barriers.
C) economic barriers.
D) cultural barriers.
Answer: B
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Below the calcium carbonate compensation depth (CCD) sediment composed of ________ will dissolve
a. silica b. diatom remains c. iron d. calcium carbonate
Which of the following statement about soil conservation is accurate?
A. Terracing reduces soil erosion. B. Strip farming is used on level ground. C. Waterways allow water to run off the land rapidly. D. Terracing reduces soil erosion, waterways allow water to run off the land rapidly and strip farming is used on level ground.
Which of the following is poorest for storing or releasing energy?
A) ADP B) AMP C) ATP D) None, they are all equally good.
Nitrogen (N2 ) is
A) a key component of life, integrated into our bodies directly from the air. B) a product of the radioactive decay of a form of potassium in the crust. C) cycled through the environment via the activity of bacteria. D) now measured at 20.946% by volume in the homosphere.