Usually my bf comes but I’m so scared he’s been feeling sick lately but he still came I’m so scared id. k what to do, i don’t think I did anything wrong

The correct answer is d

Particle exchange energy though elastic collision , hope this .

The density would be 1.622

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 .