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What's the respiratory system of planaria like?

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Flatworms (phylum Platyhelminthes) are a primitive type of worm. More than 20,000 species of Platyhelminthes exist, ranging from free-living to parasitic forms that infect up to 200 million humans (Homo sapiens) and a variety of other animals worldwide. Unlike more advanced forms of life, a flatworm doesn't have lungs. read more

Planaria do not have a skeletal, circulatory or respiratory system. Planarians are predators and scavengers and eat live or dead animals using their muscular retractable pharynx which can extend out of the mouth opening on the ventral side up to half of their body length. read more

Planaria lack specialized respiratory systems. They are larger than hydra, and have a thicker body of 3 layers instead of two compared to hydra. Planaria and other flatworms are flat to be thin enough for diffusion of gases to occur accross their skin. read more

There are many transverse nerves connected to the nerve cords extending from the brain, which makes the nerve system look like a ladder. With a ladder-like nerve system, it is able to respond in a coordinated manner. The planarian has a soft, flat, wedge-shaped body that may be black, brown, blue, gray, or white. read more

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