Most centipedes need to live in moist places, but a few can survive in deserts and dry grasslands. 1  These animals are found in the following types of habitat. 2  temperate. 3  tropical. terrestrial.  Terrestrial 1  Biomes. taiga.  desert or 1  dune. chaparral. 2  forest. rainforest. 3  scrub forest.  mountains.
Yeast are among the few living organisms that do not need oxygen in order to produce energy. This oxygen-independent state is called anaerobic (pronounced a-na-ROE-bik; without oxygen). During such anaerobic conditions, yeast convert carbohydratesâstarches and sugarsâto alcohol and carbon dioxide gas. This process is known as fermentation. The fermentation process of yeast is caused by enzymes, catalysts in chemical reactions similar to the digestive enzymes in the human body.
Most baked products are leavened by the expansion of the batter or dough. Leavening results in baked products with a larger volume with an open, porous texture. The three major leavening gases are air, steam, and carbon dioxide gas. Other leavening agents include ethanol and ammonia gas. Ethanol, which is a by-product of yeast fermentation, has a leavening effect in yeast-leavened products such as bread and rolls when it vaporizes during baking in the oven.