The role of oxygen in cellular respiration is It accepts electrons and keeps the electron transport chain running.
<h3>What is Cellular respiration?</h3>
Energy is the ability to perform a job or to produce heat. Chemical reactions involve a rearrangement of atoms between substances with rupture or formation of chemical bonds and this generates changes in the energy of the system.
An exothermic reaction is one where energy is released from the system into the environment in the form of heat.
Cellular respiration is carried out in the mitochondria of the cells. There the oxygen absorbed from the external environment is combined with carbohydrates (raw material) to release the chemical energy they contain. Water vapour and carbon dioxide are also released.
Thus, option "A" is correct.
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It is a perfect example of a natural selection.
(I'm not sure if this is the exact answer that you are looking for.)
Answer:
B. Guilt
Explanation:
The sound of the heart beating symbolized the guilt of the narrator. He had just killed the old man and the officers were in the house searching. Although things went well, he imagined the sound of the heart of the old man beating under the floorboards and it grew louder and louder as the officers were chatting with him. The narrator eventually succumbed to the loud beat and confessed his crime because he could no longer take the guilt building up inside of him.
