A sample of exhaled air from a resting human contains mostly four gases. The partial pressures for each of the four gases are listed: nitrogen (563 mm Hg), oxygen (118 mm Hg), carbon dioxide (30.0 mm Hg), and water
(50.0 mm Hg). Calculate the total pressure of the exhaled gas.
O A. 365 mm Hg
OB. 711 mm Hg
OC. 731 mm Hg
OD. 761 mm Hg

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 .

Both models are effective because they show the valence electrons, and these valence electrons indicate the reactivity of an element.