diffusion - The movement of molecules or ions from a region of higher concentration to a region of lower concentration., concentration gradient - The difference in the concentration of solutes (particles) in a solution between two regions, such as across a cell membrane., surface area - The total area of an organism or cell's outer boundary (such as the cell membrane or skin) exposed to the external environment., volume - The amount of space occupied by a substance, unicellular - A living thing composed of a single cell that performs all necessary life functions, multicellular - Complex living beings composed of more than one cell—often millions or trillions—that work collaboratively to sustain life,

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