It is like the borders of a city with small gateways to let people come out and have fresh air. In an actual nuclear membrane, it resembles pores to let waste material come out and good stuff come in.
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The ozone or an eggshell
Nuclear power stations.
a real life example of an octagon is a stop sign.
A pennant is a real life example of an isosceles triangle.
example: secretion of proteins like enzymes, peptide hormones and antibodies from cells. the cell membrane folds inward, trapping a small amount of matter from the extracellular fluid. :)