Who led a fleet of at least 317 during the dark ages?
A) Bjarni Herjulfsson
B) Prince Henry
C) Admiral Zheng He
D) Christopher Columbus
C
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This graph indicates which of the following about the global trend in fishing?
A) Despite increased effort, the total fish harvest has barely increased in the last 20 years. B) More and more fish are being harvested every year. C) Fish are declining as a source of food. D) The developing world catches more fish than the developed world.
Genetic drift refers to ________
A) a change in the overall distribution of a population B) a change in the frequency of a population's genes because of mutation C) a change in the frequency of a species' occurrence D) a change in the frequency of genes in a population because of tectonic plate movement E) a change in the frequency of a population's inherited trait brought about by a chance event
The ________ ended with the greatest mass extinction ever to occur on Earth.
A. Paleozoic Era B. Tertiary Period C. Cenozoic Era D. Precambrian interval E. Jurassic Period
The major eventual products of chemical weathering are ________
A) boulders B) small rocks C) sands D) silts E) clays