What is the main difference between High-Density PolyEthylene (HDPE) and Low-Density PolyEthylene (LDPE)?
A. One is made from high-density ethylene, the other from low-density ethylene.
B. HDPE has very long chains packed close together; LDPE has long chains that are branched and do not pack together well.
C. HDPE is more useful than LDPE.
D. LDPE is more useful than HDPE.
E. HDPE has very long chains packed close together; LDPE has short chains that do not pack together well.
Answer: B
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What term is used to describe the exclusive microecosystem picoplankton have been discovered to operate in?
a. "picoplankton economy" b. "microecosystem economy" c. "phytoplankton economy" d. "official economy"
e. "black market economy"An organism capable of synthesizing its own food solely from carbon dioxide using sunlight or chemical energy is known as a(n)
A) secondary consumer. B) heterotroph. C) autotroph. D) primary consumer.
The accompanying graph shows the number of Atlantic hurricanes since the 1880s. Based on when most global warming has occurred, one would conclude
A. no trends are apparent from this graph. B. short duration hurricanes have increased in frequency. C. all hurricanes have increased in frequency. D. moderate duration hurricanes have increased in frequency.
The refundable charge of 5 or 10 cents for returning recyclable cans and bottles works like
A. an incentive to throw bottles and cans in the trash. B. command-and-control regulation. C. a market permit program. D. a pollution tax incentive to avoid littering.