This motion is associated by mechanical means such as pumps, gravity or fans, to produce the movement of the fluid: a. free convection b. forced conduction c. forced convection d. radiation indoors

It is forced convection.

Convection is the way fluids move around due to temperature differences. When they are moved around by another means, it is forced.

It would be (at) + cu (s)

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 .