Why plants have hard cells and not for animals.
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Animal cells do not have cell walls because they do not need them. Cell walls, which are found in plant cells, maintain cell shape, almost as if each cell has its own exoskeleton. This rigidity allows plants to stand upright without the need for bones
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The primary wall lacks lignin that would make it tough and rigid, so this cell type provides what could be called plastic support - support that can hold a young stem or petiole into the air , but in cells that can be stretched as the cells around them elongate, thus plants have hard cells and not animals.
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