Digestive Syste1 - Absorptive feeders , such as tapeworms,...

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Digestive System Single-celled organisms can directly take in nutrients from their outside environment. Multicellular animals, with most of their cells removed from contact directly with the outside environment, have developed specialized structures for obtaining and breaking down their food. Animals depend on two processes: feeding and digestion. Animals are heterotrophs , they must absorb nutrients or ingest food sources. Ingestive eaters , the majority of animals, use a mouth to ingest food.
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Unformatted text preview: Absorptive feeders , such as tapeworms, live in a digestive system of another animal and absorb nutrients from that animal directly through their body wall. Filter feeders , such as oysters and 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....
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Digestive Syste1 - Absorptive feeders , such as tapeworms,...

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