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The shape of the flatworm allows it to survive without a circulation system. All of the cells are close enough to receive oxygen directly. Flatworms have both male and female sexual organs. They can mate with themselves.

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How does the number of body cavities of nematodes compare with that of flatworms?

Nematodes have a pseudocoelom (a body cavity that is not completely lined by mesoderm), whereas flatworms have an acoelomate body plan (lack a body cavity). This means that nematodes have a body cavity, while flatworms do not have a true body cavity.


How many diseases caused by flatworms?

Flatworms can cause various diseases in humans, including schistosomiasis, cysticercosis, and fascioliasis. These diseases can result from the parasitic activity of different types of flatworms and can affect various organs and systems in the body, leading to a range of symptoms and health complications.


What enables gliding movements in flatworms?

The cilia on the ventral surface of flatworms enable gliding movements by creating a smooth and coordinated motion along a surface. The cilia generate small waves of movement that allow the flatworm to glide efficiently.


Do flatworms have a skeletal system?

No, flatworms do not have a skeletal system. They belong to a group of animals called invertebrates, which lack a true skeleton. Instead, they have a soft body that is supported by a network of muscles.


What must happen for sexual reproduction to take place in a flatworm?

In flatworms, sexual reproduction occurs when two individuals mate and exchange sperm. This can happen through hypodermic insemination, where the male stabs the female with a needle-like copulatory organ to transfer the sperm. The sperm then fertilizes the eggs inside the female's body.