Biology
Which of the following may cause the breakdown of pyruvate into lactic acid in our muscles?

Lack of nitrogen
Lack of carbon dioxide
Lack of Oxygen
Lack of water

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Biology
Which of the following is true about veins?

Veins have valves; arteries do not
Veins are more muscular than arteries
Veins carry blood away from the heart, while arteries carry blood to the heart
Veins have a smaller diameter lumen than arteries

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