Because discouraged workers are not counted in the labor force, critics argue that A) unemployment problems are understated. B) changes in GDP are incorrectly tracked. C) the unemployment rate is artificially high. D) the labor force participation rate is too precise.

Which of the following factors would not contribute to allopatric speciation? a) a population becomes geographically isolated from the parent population. b) the separated population is small, and genetic drift occurs. c) the isolated population is exposed to different selection pressures than the ancestral population. d) different mutations begin to distinguish the gene pools of the separated populations. e) gene flow between the two populations is extensive.