The cell wall functions to provide a 'skeleton' structure to help support the plant cell's shape (Rickard, 2011, p.49) and is porous to allow nutrients to flow in and out of the cell (Saupe, 2011). The cell wall is made of many different types of molecules and some of these are summarised below:
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For the land speed racer, see Challenger I (car). The FV4030/4 Challenger 1 is a British main battle tank (MBT) used by the British Army from 1983 to the mid-1990s, when it was superseded by the Challenger 2. It is also currently used by the Royal Jordanian Army as its main battle tank after heavy modifications.