Please answer the following essay questions.

1		Discuss some of the problems in analyzing natural selection in human populations. Does a correlation between a genetic trait and the environment imply causation? Does a selection pressure always operate the same way at different times in human history?
2		Some scientists have claimed that race and intelligence, as determined by IQ scores, are related. What are some of the problems with this argument? Do IQ tests really measure intelligence? Can people really be divided into races, and do these races score significantly differently?