The case of the passenger pigeon best illustrates the
A. strength of natural selection.
B. theory of evolution.
C. concept of coevolution.
D. role humans play in extinction of species.
E. excellence of enforcing laws to protect species.
Answer: D
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The cumulus stage of air-mass thunderstorm development
A) is marked by strong updrafts throughout the cloud. B) is when much of the storm's precipitation occurs. C) begins when unstable air begins to rise. D) occurs before the Bergeron process starts.
Some might argue that globalization is the most fundamental reorganization of our planet's social and economic structures since which of the following events?
A) Ice Age B) Demographic Transition C) Industrial Revolution D) World War II E) the Renaissance
Volatile organic compounds (VOCs) represent a class of organic compounds that are mainly____________________, containing only hydrogen and carbon
Fill in the blank with correct word.
With respect to the U.S. transportation system, what best explains why electric motors are considered as the most sustainable means of running cars and trains in the future?
A. conventional crude oil will soon be in short supply B. internal combustion engines are too inefficient for the expected growth in population C. electricity generated by nuclear power is expected to become significantly less expensive D. fuels for internal combustion engines all produce greenhouse gases E. reserves of non-conventional fossil fuel are relatively small