The answer is move the comma to after the word once
D) While I can see Dixon's point, it's clear that he hasn't considered how the monument will affect American Indians.
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With interjections, people usually use exclamation points. Others use dashes but it's not very often.
Ex: Dang it, I forgot to write me name on the bathroom walls!
Ex: He drove- very quickly- to Wing Stop for free wings.
Answer:
The harder and more intensive your exercise is, there needs to be a proportional amount of oxygen-rich blood circulating to supply your body with the needed oxygen to continue.
Explanation:
As you exercise, you start to use more oxygen because your body is doing more work. As you use your muscles, there is an acid called lactic acid that starts to form on your muscles that causes the burning sensation you feel. The harder your exercise , the more of lactic acid there will be. The oxygen helps to clear out this lactic acid, while still supplying your body with the oxygen it requires to all body parts so they can function properly.