91Ó°ÊÓ

Animal body plans follow set patterns related to symmetry. They are asymmetrical, radial, or bilateral in form. In animals, radial symmetry usually refers to having the mouth as the central point and the rest of the body extending outward from there. Bilateral symmetry is defined as body symmetry where the body can be divided into two identical halves in one plane.

The animals that move swiftly have a bilateral symmetry.

Bilateral symmetry. Having two equal parts or symmetry of the body allows an organism to react faster to outside stimulus and since the equal parts of the body have specific functions to do and move swiftly.

Options (a) radial

Animals with radial symmetry all live in water. They rely on water currents to bring food to them. So, with animals radial symmetry cannot move swiftly.

c. sequential

Animals have no particular symmetry

d. interrupted

Animals have no particular symmetry