Bilateral symmetry allows the flatworms to move and to have sensory organs in the front. How are roundworms more advanced than flatworms? ... This allows room for all organs in between the guy and skin. They also have blood vessels.

Are roundworms more complex than flatworms?

The different phyla of worms display a great range in size, complexity, and body structure. Flatworms (phylum Platyhelminthes) are simple animals that are slightly more complex than a cnidarian. Roundworms (phylum Nematoda) have a slightly more complex body plan.

How are roundworms different from flatworms?

A flatworm has a thin, dorsoventrally flattened body. Roundworms are more cylindrical in shape and tapered to a fine point at one end. ... Flatworms generally live in bodies of water, while roundworm species can live either on water or in soil.