Heterogeneous, because you can take out or sort the ingredients in all three into separate parts
<span>The reaction required an input of energy.</span>
The answer you are looking for is called Serotonin. Please put this as the brainiest answer thank you and hope this helped.
<span>During the production of bread, yeast cells utilize the sugar and starts growing. Alcoholic fermentation takes place, during which ethanol and carbon dioxide are formed. Alcohol evaporates, and carbon dioxide provide the bread its fluffy structure.</span>