The baker mixed yeast in the dough and kept it away for the night , The next morning it had risen high up , Explain how this happened

Explanation:

Maybe this can help.

In bread making (or special yeasted cakes), the yeast organisms expel carbon dioxide as they feed off of sugars. As the dough rises and proofs, carbon dioxide is formed; this is why the dough volume increases.

explanation: grsaa

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