Cavity and solid walls. 1  A cavity wall is made up of two walls with a gap in between, known as the cavity; the outer leaf is usually made of brick, and the inner layer of brick or concrete block.  A solid wall has no cavity; each wall is a single solid wall, usually made of brick or stone.
A cladogram (from Greek clados branch and gramma character) is a diagram used in cladistics which shows relations among organisms.
For help on how to use cladograms in Wikipedia, see Help:Cladograms A horizontal cladogram, with the ancestor (not named) to the left A vertical cladogram, with the ancestor at the top