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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Wind turbines kill more birds than which of the other major causes of bird mortality?
A) towers B) cats C) pesticides D) collisions with windows E) All of these kill more birds than are killed by wind turbines.
By 100 CE, Rome had reached the population of
A) Two millions B) Half a million C) One million D) One hundred thousand
In food webs, toxic chemicals tend to accumulate and concentrate most in the
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