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When you make bread, if you just mix flour, sugar and water, the dough does not rise, and the bread will be flat and hard. If you include yeast in the bread dough, then the dough rises and the bread is bigger and fluffier. Can you explain how the yeast helps the bread dough to rise?
yeast + sugar + water + flour ------> carbon dioxide in bread = fluffy bread.
Without sugar, no carbon dioxide is created, and the bread will not rise.