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The Digestive System: How It Works
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The digestive systems works on nutrients taken from the environment, breaking them down into simpler products, and then absorbing the products together with water and salts so they can be used in metabolism.
The individuals of all species contain many different protiens or carbohydrates in the cell walls of bacteria, chitin in the external skelet ....
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....s, tunicates, and all vertebrates. A few animals with digestive tracts also partially digest their food before eating it. Some spiders, for example, pierce their prey with fangs that pump digestive fluids into the victim. This liquefies the softer parts, which the spider then sucks into its stomach and intestine, where digestion is completed.
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| Word count: 1022 |
Page count: 4 |
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