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.
Cladogram deduced in cladistic analysis. The cladistic data matrix contains one outgroup taxon (OG), three ingroup taxa (A, B, C), five characters (1â5), and 20 character states. The outgroup taxon is used for comparative hypothesis testing (ideally, at least two should be used).