Question

why yeast is necessary to make bread​

Answer 1

Answer:

Yeast is essential to the rise of bread, not only because it produces carbon dioxide, but also because it produces alcohol that evaporates as the bread bakes, and because it helps develop and strengthen the gluten network.

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Answer 2

Answer:

because yeast do anaerobic respiration which is also known as fermentation which results in release of CO2 which causes baking of bread