muscle, Nerve, excretory, and reproductive organs
yes
Yes. Somewhat simpler than us, but not primitive.
heres 2: Reproductive Organs Coelom (these are 2 of the answers to question #3 Mr. Mikinney's homework assignment today 11/2/10)
No, flatworms and roundworms are not single-celled eukaryotes; they are multicellular organisms that belong to the animal kingdom. Flatworms are part of the phylum Platyhelminthes, while roundworms belong to the phylum Nematoda. Both are classified as invertebrates and exhibit complex body structures, with specialized tissues and organs.
Roundworms breathe through their thin, permeable skin which allows gases to pass in and out of their bodies by diffusion. They do not have specialized respiratory organs like lungs or gills. Oxygen dissolved in water is absorbed through their skin, while waste gases like carbon dioxide are released out.
They have a coelom, a space between the skin of the roundworm that allows the organs to move around freely by themselves.
Toxocara canis and cati, Ascaris lumbricoides, Baylisascarisprocyonis
Roundworms
Roundworms belong to the phylum Nematoda.
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.
Roundworms can cause serious damage to humans and other living things. Roundworms also live in pigs, so when people eat it pork undercooked, they can have roundworms inside their body, where it causes a disease. Earthworms cannot do any of these things that roundworms can do. (Roundworms are parasites, so if you don't want to have parasites inside your body organs, DON'T EAT UNDERCOOKED PORK OR ANY TYPE OF MEAT)
Roundworms can harm dogs ect;