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

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

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Biology
Which statement best describes Arteries?

They have thin walls and transport blood toward the heart
They have thin walls and transport blood away from the heart
They have thick walls and transport blood toward the heart
They have thick walls and transport blood away from the heart

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