Animals

~symmetry
-radical
-lack mesoderm
(Chideria lack mesoderm)
Chideria have mesoyliea (glue)

Bilateral symmetry-
~Dorsal and Ventral
~Anterior and Posterior
~Cephalization

Body cavities
-acoelomates "without body cavity"
-pseudoceolomates "fake body cavity"
-celomates "without body cavity", cavity in the middle of mesoderm.

Tissue layers:
-ectoderm (skin) outside
-messoderm middle
-endoderm inside
~Digestive track from endoderm.
~Outside tissue of guts- mesoderm.
Ectoderm- outside skin.

Development
Blastula Invagination:
Protostome- mouth comes 1^st
Dueterostome- anus comes 1^st

Sesslle- stationary or stuck down (sponges)
~Chideria (nerve net)- no central nervous system, but there is a network of nerves.