Find the LCD for each of the following; then perform the indicated operation. 
Definitions:
Aquaporins
A class of proteins that form channels in the cell membrane and facilitate the transport of water between cells.
Plasma Membrane
The lipid bilayer that surrounds a cell, regulating the entry and exit of substances.
Water
A clear, tasteless, odorless, and nearly colorless chemical substance, which is the main constituent of Earth's hydrosphere and the fluids of most living organisms.
Plasma Membrane
The lipid bilayer that encapsulates a cell, controlling the movement of substances into and out of the cell.
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