How does Yeast Make Bread Rise?

Answer

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 carbon dioxide and ethanol alcohol. These gases cause the dough to expand. You can find more information here: http://www.wisegeek.com/why-does-yeast-make-bread-rise.htm
1 Additional Answer
Yeast has carbon dioxide that makes food ferment. This is what makes the dough rise. The gas that is trapped needs to go somewhere and that is up, hence the rising. And there you have it. you can read more at www.wikianswers.com and look for your question.
Q&A Related to "How does Yeast Make Bread Rise?"
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
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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
http://answers.ask.com/Food_and_Drinks/Food_and_Co...
only if the yeast is not
http://wiki.answers.com/Q/When_will_bread_not_rise...
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