The correct answer is membrane. Just like the fence protects the yard so does a membrane protect the cell. It prevents things from getting in or out unless .Yard is to fence as cell is to membrane. Just like a fencesurrounds a yard and allows certain objects in and out, a membranesurrounds the cell and only allows .Nucleus..Wam Bam Premium Yard and Pool Vinyl Fence Panel with Post and Cap – 4 ft. Product – Trademark Home Extend A Fence Instant Home Fencing. Product Image..

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