Cell Boundaries. A country and it's boundaries.Cell have boarders that separate it from its surroundings.All cells are surrounded by a thin, flexible barrier known as the cell membrane.Many cells also produce a strong supporting layer around the membrane known as a cell wall.. . Cell Membrane. The cell membrane regulates (controls) what enters and leaves the cell and also provides protection and support.The composition of nearly all cell membranes is a double-layered sheet called a lipid bi224
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