Which of the following has been shown to cause liver cancer and harmful genetic mutations in animals?
A) DDT
B) Methyl mercury
C) PCBs
D) Polycyclic aromatic hydrocarbons
E) Sewage sludge
C
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A(n) ________ stream flows in a network of rivulets (subchannels) around numerous sandbars.
A. channelized B. incised C. braided D. rilled E. meandering
The ________ is based upon the observation that fossil species succeed one another through layers in a predictable order.
A. principle of faunal succession B. principle of original horizontality C. principle of unconformities D. principle of lateral continuity E. principle of radioactivity
Current worldwide food production is less than in previous decades.
Answer the following statement true (T) or false (F)
Answer the following statement(s) true (T) or false (F)
1. A new challenge to Japanese farmers is cheaper produce from the Philippines. 2. North Korea's main bargaining chip for foreign aid is its oil. 3. Because of the one-child policy, China's population is no longer growing. 4. Construction of the Three Gorges Dam will solve all China's energy needs. 5. The Terracotta Warriors in China are found in Xi'an.