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Design a controlled experiment to determine which activity has more of an effect on a person's heart rate jumping rope or doing push-ups.
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If e is the symbol for an element, which two of the following symbols represent isotopes of the same element? 1. e2. e3. ea.1 and 2c.1 and 4b.3 and 4d.2 and 3
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Comparing john newland’s octaves with the modern periodic table, which 5 elements have been discovered between hydrogen and iron since newland’s time?
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Design a controlled experiment to determine which activity has more of an effect on a person's heart...
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