I would say hydrophilic molecules that provide energy for the body. Hope it helps!
Internal means its on the inside
external means its on the outside
so an internal regulator is when the proteins respond to events on the inside of a cell
and an external regulator is when the proteins respond to events outside the cell
It is a protein and it functions in a red blood cell to help carry oxygen
<span>You wouldn't be able to defend against germs</span>
