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a pure substance made of only one type of atom. An element cannot be broken down into simpler substances.
rain that contains high levels of sulfuric acid, hydrochloric acid and nitric acid.
pigments that occur in the brightly coloured, yellow, orange or red parts of the plant, such as...
a reproductive structure in fungi that is a bit like a seed. But unlike a seed, it can be...
the dramatic increases in crop production around the world from the second half of the twentieth...
a liquid-filled body cavity formed within the mesoderm of some animals. The cavity occurs...