Answer: Ice cores.
Explanation: Ice cores are commonly studied by scientists to find out what the climate was like decades and centuries ago.
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<span>RATIONALE: </span>
<span>The patient with chronic obstructive pulmonary disease (COPD) develops a barrel chest over time because trapped air enlarges the lungs and thoracic cavity, thereby reducing chest flexibility. Sunken chest, also known as funnel chest or pectus excavatum, is not related to COPD. Hyperventilation is not characteristically seen with COPD. Instead, the patient usually displays persistent dyspnea on exertion, with or without a chronic cough. Circumoral cyanosis is a bluish discoloration of the skin surrounding the mouth. It is usually an indication of a severely diminished level of oxygen and respiratory distress. Circumoral cyanosis can result from a variety of respiratory diseases and may be a late sign of the COPD disease process.
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Answer:
NAD is reduced
Explanation:
Glycolysis is the first step in the breakdown of glucose in order to generate energy for cellular metabolism. Glycolysis helps to convert glucose into pyruvate and hydrogen ion.
In redox reaction, oxidation is the removal of hydrogen and reduction is the addition of oxygen. In the process of glycolysis, the NAD is reduced to form NADH and H.
If NAD is not present, glycolysis will not be able to continue. During aerobic respiration, the NADH formed in glycolysis will be oxidized to reform NAD+ for use in glycolysis again.
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