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What is a good analogy for cell wall?

April 26, 2017analogy Biology CELL good Mathematics wall

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What is a good analogy for cell wall?

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Merely draw the skin of a human. It relates to a cell wall in that it acts as protection (a barrier from pathogens) and is used for absorption (oxygen, carbon dioxide, sunlight). Cell walls are important as they act as protection and are used for absorption of nutrients. ————- On second thought, I have another idea which I believe is more creative. Draw a bathroom sponge. Sponges are used for absorption – water, and for protection (cleaning).