Which is a characteristic of an electromagnetic wave?
the waves are produced when an electric charge is at rest.
the fields are independent of each other.
the fields are aligned with each other and aligned to the direction of travel.
the fields are at right angles to each other and to the direction of the wave.

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 .

Ibelieve it's celsius. hope this .

High-energy and unstable.