Attack 1 : Composition Cell walls divided into three layers: primary wall, secondary wall and intercellular layer. Cell walls' main ingredients are cellulose and pectin.
Attack 2 : Nature Primary and secondary wall have a big different on their physical properties. Primary wall is very soft and flexible. Secondary wall is very hard. Therefore, the secondary wall's elastic is lower but have a higher tension.
Comments : Cell walls only exist in plants, fungi, algae and prokaryotes; not in animals.
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