Symmetry
  Animals can be classified based on symmetry.
  There main types of symmetry are:
1.  Asymmetry
2.  Radial Symmetry
3.  Bilateral Symmetry
Asymmetry
  Asymmetry: No Symmetry.
  The simplest forms of animals have no symmetry.
  Asymmetrical animals have no general body plan or
axis of symmetry. (ex: sponges)
Axis of Symmetry
  Axis of Symmetry: Line that can be drawn through the
center of an organism and divide it into half.
Draw the Axis of Symmetry in Each Picture
This Picture Has 2 Axes of
Symmetry
Radial Symmetry
  Radial Symmetry: Symmetry in a circle.
  Animals that have body parts organized about a central
axis like the spokes in a bicycle wheel have Radial
Symmetry.
  This allows animals to reach out in all directions from
one central point. (ex: jellyfish and starfish)
Bilateral Symmetry
  Bilateral Symmetry: One Plane of Symmetry
  This produces mirror halves.
  Most complex animals (ones we think of) show
bilateral symmetry.