At physiological pH, the carboxylic acid group of an amino acid will be , while the amino group will be , yielding the zwitterion form.

Ibelieve the answer is d

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 .

It’s completely renewable in that we don’t need to consume anything to get energy. essentially after we can harvest it, it’s free energy