Write the molecular formula of nitrate using criss cross method

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In pqr m< p=60 m< q= 30 and m

What produces wave a)sound b) heats c)transfer of energy d)vibrations

Scientists have developed an explanation of a phenomenon from several verified hypotheses. the explanation has been confirmed through numerous experimental tests.which option best describes this explanation? a. scientific lawb. research questionc. hypothesisd. scientific theory