I think the answer is trees
I believe its large blue vessel also known as vena cava
The higher the number of cells getting wired together in a photo-voltaic cell, the higher its electricity or energy yield would be. In addition, the primary function of a PV panel is to convert light energy from the sun directly into electrical energy in a form of voltage that could be used by electricity-consuming devices.
The answer is A. macromolecules
There are 4 types of macromolecules; lipids, proteins, carbs and nucleic acids