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Why is it necessary that only one variable be changed in an experiment, and that all other variables remain constant? Need help ASAP!
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The body is protected against harmful flu viruses by
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9. wind power creates pollution. water air soil noise
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Which of the following produces carbon dioxide? a. plants b. animals c. decomposers d. all of the above
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Amino acids contain the elements carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur. of the 20 amino acids found in humans, 11 are called "nonessential" because they can be manufactured by the body when needed. which elements in these 11 amino acids are commonly obtained from the metabolism of sugar molecules?
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Why is it necessary that only one variable be changed in an experiment, and that all other variables...
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