: single-celled photosynthetic bacteria : mass of stone or metal that has passed through the atmosphere and struck the earth's surface : mass of stone or metal traveling through space : a molecule composed of three oxygen atoms; absorbs UV radiation : process by which plants use chlorophyll and energy from sunlight to manufacture food from carbon dioxide : the process by which oxygen combines with food to release energy and carbon dioxidea. photosynthesisb. respirationc. meteorite d. cyanobacteria e. meteoroid f. ozone

both anaerobic and aerobic respiration use glucose (or other carbohydrates), proteins and lipids to produce atp and nadh. cell uses those energy molecules, obtained from food and   breaks them down during the chemical reactions of respiration. in anaerobic respiration, nadh is regenerated to nad+ by enzymes lactate dehydrogenase (lactate is produced, e.g. in muscle cells) or by alcohol dehydrogenase where ethanol is produced (alcohol fermentation), while in aerobic respiration, electrons from nadh are deposited in the mitochondria to regenerate nad+ (electron transport chain. anaerobic respiration produces 2 atp per molecule of glucose compared to aerobic respiration where about 38 atp molecules are produced.

the answer is c.) there is a warm front in region a and a stationary front in region b.

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.