1 While files like these help a computer to pull up websites faster by remembering common images and bits of inâ¦. 2  Crochet 101: Choosing the Right Scarf Size One of the most popular and simple crochet projects for the beginner is a scarf. 3  It is a straightforward pattern that utilizes the same stitch repeated throughout.
clade. n. A grouping of organisms made on the basis of their presumed evolutionary history, consisting of a common ancestor and all of its descendants. [From Greek.lade. n. A grouping of organisms made on the basis of their presumed evolutionary history, consisting of a common ancestor and all of its descendants. [From Greek.
Phylogenetic systematics, a.k.a. evolutionary trees : Reading trees: A quick review. A phylogeny, or evolutionary tree, represents the evolutionary relationships among a set of organisms or groups of organisms, called taxa (singular: taxon).he tips of the tree represent groups of descendent taxa (often species) and the nodes on the tree represent the common ancestors of those descendants. Two descendents that split from the same node are called sister groups. In the tree below, species A & B are sister groups  they are each other's closest relatives.