Global warming has led to less snow cover in some areas. Snow cover provides insulation for
some burrowing, hibernating animals. In a population of rodents, some animals have slightly
thicker fur, and animals with this trait are more likely to survive the winters with low snow
cover and thus produce offspring in the spring. This scenario is an example of
a. an adaptation.
b. evolution.
c. natural selection.
d. homology.
C
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Directional selection would be expected to occur if
A. a new allele arises by mutation that increases fitness. B. the environment changes. C. the population is large. D. a new allele arises by mutation that increases fitness and the environmental changes increase the allele frequency. E. a new allele arises by mutation that increases fitness, the environment changes and the population is large are correct.
To which class of neurotransmitters does dopamine belong?
a. acetylcholine b. monoamines c. amino acids d. neuropeptides e. gaseous neurotransmitters
Genome sequence comparisons have now shown that the Korarchaeota are most likely a subgroup of
the Euryarchaeota.
Indicate whether the statement is true or false.By 10,000 years ago, about ________ people inhabited the entire world; today there are over ________.
A. 350,000; 300 million B. 65 million; 9 billion C. 5 million; 6 billion D. 500,000; 1 billion E. 1 million; 20 billion