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A flatworm has a combination digestive/excretory system. It takes food in and gets rid of wastes through the same opening.

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A flatworm takes in oxygen, but has no formal respiratory system.

They use cilia (hair like structures) to move

Three-striped flatworm (Pseudoceros tristriatus) - Encyclopedia of Life

There are more than 10,000 species of flukes of known existence today.

Turbellarians are free-living carnivorous worms. They are commonly brightly colored and live in or on oysters, crabs, and other sea creatures.

Hypselodoris kanga from Lembeh, Indonesia

Hypselodoris kanga nudibranch photographed in Lembeh, Indonesia