Mutations in the V(J)D genes is called which of the following?
A) affinity maturation
B) affinity mutation
C) cancer
D) none of these
A
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Which type of agriculture is found primarily in less developed countries?
A) Mediterranean B) plantation C) truck farming D) commercial gardening E) None of these is found in LDCs; they are all commercial agriculture.
The two highest levels of the atmosphere contain only small amounts of oxygen, nitrogen, and ozone. These layers are the
A) mesosphere and thermosphere. B) thermosphere and stratosphere. C) stratosphere and troposphere. D) thermosphere and troposphere.
Which of the following continents is currently experiencing the most rapid population growth?
A) Africa B) Antarctica C) South America D) Asia
Historical data indicate that the Sahara Desert once had a wetter and milder climate
Indicate whether the statement is true or false