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

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

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Biology
Which statement concerning the diagnosis of ADHD is true?

About 20 percent of school-age children are diagnosed with ADHD
Racial minority status is a good predictor of being diagnosed with ADHD
Boys are more likely to be diagnosed with ADHD than girls
Most children "outgrow" symptoms of ADHD

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