1. Adaptive radiations are associated with a distinctive
phylogeny because of the rapid divergence of a single lineage. Pick
some reasonable number of species (6- 10) and diagram a phylogeny
that depicts an adaptive radiation. What aspects of this phylogeny
are distinctive? How did you depict the branch lengths? Should they
differ through the tree over time?

2. How do changes in rates of speciation influence branch
lengths? Redraw your phylogeny showing how a slower and constant
rate of speciation alters the macroevolutionary pattern.

3. How do changes in rates of extinction influence branch
lengths? Redraw your phylogeny with slow, constant speciation
rates, showing how a greater rate of extinction alters the
macroevolutionary pattern.

4. Describe a scenario, using a phylogeny, where the extinction
process can lead to the same phylogenetic pattern as an adaptive
radiation. Can high rates of speciation be distinguished from low
rates of extinction?