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Where do the respiratory and circulatory systems meet? a. in the heart b. in the muscles c. in the lungs d. in the brain
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How can a geological time scale best be reconstructed? a) comparing vestigial structures in living species b) comparing homologous structures in living species c) examining homologous structures in fossil remains d) examining the written records of scientists from past cultures
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Which of the follow describes a disadvantage secondary sources have compared to primary sources?
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Erin is studying the rate at which bananas turn brown as part of her science
fair project. Her teac...
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