The body's primary source of energy is the nutrients from food and also water but mostly food <span />
D. Showing appreciation for what is being said
"Pacemaker" is the one choice among the following choices given in the question that is the treatment that can also regulate heart rhythmsthat has replaced drugs in some cases. The correct option among all the options that are given in the question is the first option or option "A". I hope it helps you.
a calming the critic you welcome