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a molecule that is built up of two or more different elements that are chemically joined together in fixed proportions.
tissue that binds organ components and organs together and supports structures of the body.
a hard granule of crystallised minerals which forms in the kidney.
pigments that occur in the brightly coloured, yellow, orange or red parts of the plant, such as...
substances that have a harmful effect on the environment and also on human health.
a prolonged period of low rainfall which has a negative effect on plant, animal and human life...