Baking bread and making wine are dependent on?

sac fungi

"a packet of baking yeast holds spores of the sac fungus saccharmyces cerevisiae. when bread dough is set out to rise in a warm place the spores germinate and release cells that reproduce by budding. bubble of carbon dioxide produced by the fermenation of reactions in these cells cause dough to expand. fermentation by s. cerevisia also helps us produce beer and wine"

straight from the Biology book