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Which effects resulted from the development of new technologies, such as installation of solar panels or the use of geothermal energy, to prevent global warming? 

Mei wants to study whether heart rate increases more during certain exercises than during others. She designs an experiment to test the heart rates of classmates in the morning and in the evening for three days, immediately after doing jumping jacks, doing push-ups, or running in place. What is the dependent variable in this experiment?

Which statement best describes the equation CaCO3 + 2HCl → CaCl2 + CO2 + H2O?

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(Top Tutor) Daniel C.
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