Chapter 30 - Animal Origins and the Evolution of Body Plans - 30.2 - Animals Diverged with Distinct Body Plans - 30.2 Recap - Learning Outcomes - Page 643: 1

All animals either have bilateral symmetry, radial symmetry, or no symmetry. Bilaterally symmetrical animals such as fish and humans are generally more complex than animals with other symmetry and possess a greater range of motion. The movement of radially symmetrical organisms such as jellyfish is mostly restricted to up and down. Animals without symmetry, such as sponges, are considered the least advanced and are almost always sessile.

All animals either have bilateral symmetry, radial symmetry, or no symmetry. Bilaterally symmetrical animals such as fish and humans are generally more complex than animals with other symmetry and possess a greater range of motion. The movement of radially symmetrical organisms such as jellyfish is mostly restricted to up and down. Animals without symmetry, such as sponges, are considered the least advanced and are almost always sessile.