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hollow tubular vascular tissue cells, strengthened with lignin that conducts water and mineral salts between roots, stems and leaves.
irreversible disease where the alveoli are damaged, resulting in breathing difficulties.
pollutant gases such as nitrogen monoxide and nitrogen dioxide. They are produced during ...
a prolonged period of low rainfall which has a negative effect on plant, animal and human life...
the collection and disposal or recycling of waste materials and the monitoring of waste.