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Which of these serves as a reference for comparison during a scientific investigation? a)outcome variable (dependent variable) b) test variable (independent variable) c)control group d)hypothesis
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When does the circulatory system work with the respiratory system? a. during blood cell formation b. during cellular respiration c. during intestinal digestion d. during a viral infection
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How are mutations continually being generated in a population (what are some of the causes of mutatuions? ) explain
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What determines the order of elements in today's periodic table??
btw for the subject it’s science...
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