Body plan & cephalization
Allow for specialized regions to develop,
And they provide room for internal organs to grow and expand
Usually found in
Animals with bilateral symmetry
Some contain fluids that
Are involved in circulation, feeding, and excretion
Body cavity formation
Fluid filled space that lies between the digestive tract and the body wall
Provides space in which
Internal organs can be suspended so they will not be pressed on by muscles
Cephalization
The concentration of sense organs & nerve cells at the front end of the body
Animals with cephalization responds to
The environment at a quicker rate
The more evolved,
The more pronounced the cephalization