WHY DO LEAVES CHANGE COLOUR? - LEVEL 3 cambridge universit
Why are flowers different colours? How do we know how old a tree is? How can plants grow in deserts? You can find the answers to these and other questions about plants in Why Do Leaves Change Colour?
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WHY DO BRIDGES ARCH? - LEVEL 3 cambridge universit
What holds up skyscrapers? Why are sports domes curved? Why are triangles used in many bridges? You can find the answers to these and other questions about structures in Why Do Bridges Arch
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