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Chemistry, 22.06.2019 16:50
Which of the following is an indication that a substance has undergone a chemical change? a. no new product has been formed. b. the color of the substance has not changed. c. the original constitute has not changed. d. the molecular structure has changed.
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Chemistry, 23.06.2019 00:30
The footprints of a dinosaur and the burrow of an ancient shrimp are examples of which kind of fossils
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