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Unformatted text preview: mussels, collect small organisms and particles from the surrounding water. Substrate feeders , such as earthworms and termites, eat the material (dirt or wood) they burrow through. Fluid feeders , such as aphids, pierce the body of a plant or animal and withdraw fluids. Ulcers Peptic ulcers result when these protective mechanisms fail. Bleeding ulcers result when tissue damage is so severe that bleeding occurs into the stomach. Perforated ulcers are life-threatening situations where a hole has formed in the stomach wall. At least 90% of all peptic ulcers are caused by Helicobacter pylori . Other factors, including stress and aspirin, can also produce ulcers....
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- Fall '10