According to data from the National Survey on Drug Use and Health (2006), in the 18 to 25 age group, which of the following substances had the highest usage? a. ecstasy
b. cocaine
c. alcohol
d. marijuana

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.

The graph shows how much money the south dakota livestock industry earns annually. according to the graph, which industry would experience the greatest financial impact from a loss of pastureland

How is the expression of surface antigens on red blood cells determined?