Final answer:
An asymmetrical body plan differs from radial or bilateral body plans by lacking any form of symmetry in the arrangement of body parts. Examples of asymmetrical organisms include sponges or amoebas.
Step-by-step explanation:
An asymmetrical body plan differs from radial or bilateral body plans in terms of symmetry. Radial symmetry is when an organism's body parts are arranged in a circular pattern around a central axis, such as a starfish. Bilateral symmetry is when the organism can be divided into two equal halves that are mirror images of each other, such as a human. In contrast, an asymmetrical body plan lacks any form of symmetry, meaning there is no pattern or symmetry in the arrangement of body parts. Examples include sponges or amoebas. Asymmetry allows organisms to adapt to different environments and perform specific functions more efficiently.