Give an example of a free living flatworm and describe two characteristics that all flatworms share.

 The class Trematoda consists of flukes. Flukes are parasitic flatworms that require two hosts to complete their life cycle. They begin their lives in a lower life form like a snail, then move on to invade humans and other animals. Flukes, says Animal Planet, are generally found in the tropics and Far East, but can also be found in other parts of the world. They spread infection and disease in humans and animals. Common flukes include blood flukes, Chinese liver flukes and lancet liver flukes.

Flatworms are unsegmented worms with a tail and a head end. They are bilaterally symmetrical with a definite upper and lower surface. They have no body cavity or and no specialized respiratory or circulatory organs.

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stress fractures occur largely in the feet and legs and are common in sports that require repetitive impact, primarily running/jumping sports such as gymnastics or track and field.