A clay-rich soil may hold a great deal of water; however, such a soil may not necessarily be desirable in an agricultural setting because clay soils
A. are often too acidic for most crops.
B. are nutrient-poor.
C. are often slow to drain due to their low permeability.
D. release toxic heavy metals, which are incorporated into plant tissues.
Answer: C
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A) Two millions B) Half a million C) One million D) One hundred thousand
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In food webs, toxic chemicals tend to accumulate and concentrate most in the
A) top carnivores. B) herbivores. C) omnivores. D) autotrophs.
Wind turbines kill more birds than which of the other major causes of bird mortality?
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