Where on the phylogenetic tree should the origin of alveoli structure appear? see section 27.4 (page 557) ?

The origin of alveoli structure on the phylogenetic tree is at the base of alveolates. A phylogenetic tree is a diagram that represents evolutionary relationships among organism. A phylogeny or evolutionary tree, represents the evolutionary relationships among a set of organisms or groups of organisms called taxa. The tips of the tree  represents groups of descendant taxa and the nodes on the tree represent the common ancestors of those descendants. 

Diagrams for sure 67(8? ; 4

Yes yes yes very good