Blistering can also be a symptom of certain infections: 1  Impetigo is a bacterial infection of the skin that can occur in both children and adults, and sometimes shows up after a viral infection. 2  Blisters are a symptom of impetigo. 3  Chickenpox is an infection caused by a virus.
Family trees are a genealogical tool which records information from searches into family history. It is intended to give an overview of any given family either as far back as they can be researched or the family name originates. It shows which people belong to the family by adding them on to different 'branches'.
A clade (from Ancient Greek: ÎºÎ»Î¬Î´Î¿Ï, klados, branch) is a group of organisms that consists of a common ancestor and all its lineal descendants, and represents a single branch on the  tree of life .ladogram (family tree) of a large biological group, showing the last common ancestor of the composite tree, which is the vertical line 'trunk' at the bottom.