When a student raises her hand so that she can answer a teacher's question, the branch of the peripheral nervous system was responsible for her hand going up.

motor (efferent)

Explanation:

The somatic nervous system is the component of the motor division of the peripheral nervous system. The motor division of the peripheral nervous system carries the motor information from the central nervous system to the muscles and/or glands. The motor branch includes the somatic and autonomic nervous system. The somatic nervous system of the motor branch delivers the motor information from the CNS to skeletal muscles resulting in the generation of voluntary responses such as raising hand in a class.  

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.

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