Read the following scenario to answer the following question. An abundant and continual supply of ATP is necessary for all living cells. Active muscle cells require an extraordinary amount of ATP to permit strenuous exercise for prolonged periods. Toxins, reduced blood flow, and a compromised respiratory system can interfere with the transport of oxygen to active cells. A runner in a marathon faces multiple obstacles to continue to produce sufficient ATP to remain competitive. Breathing faster when we exercise is necessary to expel .

Carbon dioxide and also bring in more oxygen for supporting the aerobic metabolism

Explanation:

 The aerobic metabolism is one of the type of process in which the body basically helps in creating the energy in our body by the process of combustion of the fats and carbohydrates in the oxygen presence.

According to the given scenario, when we doing exercise the breath become more faster and at that specific time it is very important to expel the carbon dioxide and then inhale more oxygen for supporting the aerobic metabolism in the our body system.

 Therefore, The given answer is correct.      

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step 1 ammonium can be absorbed by plants, but some is converted into nitrates which are better for plants to absorb. this is called nitrification. 2. step 2 the deer eats the plants and uses the nitrogen-containing proteins for cell growth. 3. step 3 bacteria in the soil conduct nitrogen fixation to convert nitrogen gas from the atmosphere into ammonium. 4. step 4 some of the nitrates are absorbed back into plants, but denitrification breaks down the nitrates into nitrogen gas released back into the atmosphere. 5. step 5 nitrogen is found in the urine, which gets broken down into ammonium through the process of ammonification. 6. step 6 plants absorb the ammonium and begin assimilation, the process to add the nitrogen to protein.