RQ6.1 In considering the overview of microbial diversity (pp.
142-147), what are some general conclusions about their
diversification in terms of our current successes or failures to
resolve their branching history?

RQ6.2 Related to the last question, what evidence suggests that "gram
positive" bacteria are a natural taxon (i.e., a clade) whereas "gram
negative" bacteria are not?

RQ6.3 Briefly characterize the "great plate count anomaly" (p. 148).

RQ6.4 Related to the last question, what have we learned by recent
progress in sequencing uncultured microbes?

RQ6.5 What is extreme about "extremophiles"? How have we harnessed
some of their extreme adaptations?

RQ6.6 Give an example of the use of comparative analysis used to
identify adaptations to growth in extreme conditions.