As plastics discarded in the marine environment degrade, they can produce and concentrate
A. DDT
B. bisphenol A (BPA)
C. PCBs
D. All of these choices are correct.
Answer: D
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In which century did the majority of the nations of Africa and Asia gained independence from their European colonial masters?
A) 18th century B) 16th century C) 17th century D) 19th century E) 20th century
Proven uranium reserves are found in many continents; of the countries listed below, the country with the least known reserves is ________
A) Brazil B) Canada C) Uzbekistan D) Kazakhstan E) Namibia
What accounts for most of the total value of world trade transported by sea?
A) aluminum ore B) finished goods C) oil D) grain
When carrying a heavy bag of beverages, you bang your hand against the wall. The concept that best explains why your hand hurts is
A. inertia. B. resistance. C. gravity. D. none of the above