Respuesta :
Option(b) i,e, they have a true body cavity is NOT a characteristic of flatworms.
Platyhelminth also called flatworms, platyhelminth is a class of invertebrates with soft bodies that are typically very flattened. There are several free-living flatworm species, but around 80% of all flatworms are parasitic, meaning they live on or in another organism and get their nutrition from it.
Cilia are small, delicate structures that flatworms use to help them move. They have three tissue layers: ectoderm on the outside, mesoderm in the center, and endoderm on the inside.
This vast phylum contains parasitic flatworms, such as liver flukes and tapeworms. They lack an anus, are triploblastic, bilaterally symmetrical, and have no body cavity.
The evolution of mammalian kidneys and the regeneration of organs are both better understood because of flatworms. Even while our systems are perfectly competent in replacing billions of cells each day, such as kidneys, they utterly fail when it comes to doing so.
To know more about flatworms refer to: https://brainly.com/question/10703509
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