Roundworms are multicellular organisms that possess longitudinal muscles and a complete digestive tract, with a mouth and an anus. Their body plan is characterized by a single body cavity that houses their organs, including their nervous and reproductive systems.
no won has an opening
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 splitting of the mesoderm tissue. Also, flatworms only have one opening in their digestive system unlike roundworms with two.
Ascaris lumbricoides is the name of one of the more widely known roundworm. All roundworms including Ascaris lumbricoides belongs to phylum Nematoda.
The mouth is only one opening into the human body.
That's just the way God made them. Flatworms and roundworms have certain body cavities that basically help them digest food,respire,reproduce,and even move from one place to another.
They have one opening opening according to Biology flatworm notes I found. By Khoa
A jellyfish
Many roundworms that live in the soil attach to the root hairs of green plants and suck out the plant juices. These parasitic worms cause tremendous damage to many crops all over the world. Roundworms are particularly fond of tomato plants. Other roundworms live inside plant tissues, where they cause considerable damage. ChaCha!
They don't have one.
Indeed.
Neither, it does not have one