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Yeast (fungus) makes bread rise when it responds to warm water and exposure to the sugars in the bread/flour. The yeast starts to eat, actually digesting some of the sugar! The process
http://answers.ask.com/Food_and_Drinks/Other/why_d...
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Yeast causes bread to rise by fermentation. Yeast is hungry and it wants to eat. That is why sugar is an ingredient in many bread recipes that are not sweet. Once yeast feeds on the
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Yeast is a living organism that lives out its life cycle completely during the process of making bread. During this process it feeds, then releases gases into the dough, specifically
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only if the yeast is not
http://wiki.answers.com/Q/When_will_bread_not_rise...
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