yeast uses glycolysis and alcohol fermentation to break down sugars in dough then it releases alcohol and carbon dioxide as waste and the carbon dioxide gas causes the bread to rise
The temperature of the crust is much cooler than the interior.
Hope this helped :)
Answer:
Pigmentation, (skin color), in humans has evolved under selection pressure from the duration and intensity of sunlight. Ancestral populations near the equator were selected for dark skin, while those living in higher northern latitudes were selected for lighter skin.
