How was the work of Newlands similar to that of Mendeleev on the periodic table? They both arranged the elements in order of increasing atomic mass.
They both arranged elements that had similar properties into groups.
They both predicted the positions of undiscovered elements on the table.
They both placed the relative atomic mass of each element on the table.

A. They both arranged the elements in order of increasing atomic mass.

Explanation:

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The independent variable is the type of music.the dependent variable is the pulse rate.the intervening variable is the age of the subject.if the mother does not like rock, her pulse is likely to not increase.the same might be true for the sister.the friend may like rap and gets excited.to establish cause/effect relationship, all of the subjects must be consistent.hope i .