In geophysics the refraction or reflection of seismic waves is used for research into the structure of the Earth's interior, and man-made vibrations are often generated to investigate shallow, subsurface structures.
Flatworms are considered acoelomate, since they have no body cavity, and roundworms are pseudocoelomate because they have a body cavity, but it is not derived from the splittiâ¦ng of the mesoderm tissue. Also, flatworms only have one opening in their digestive system unlike roundworms with two.
There are different types/species of flatworms. A flatworm is in the family of platyheliminthes and has a flat body with bilateral symmetry. They also have soft but solid body â¦ 's. If I'm not mistaken, they are parasitic life forms. flatworm is in the family of platyheliminthes and has a flat body with bilateral symmetry. They also have soft but solid body â¦ 's. If I'm not mistaken, they are parasitic life forms.