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hard outer supportive skeleton of an animal.
tissues that are responsible for the transport of substances within the plant.
thin layer of living tissue between the xylem and the phloem, which is able to divide to make...
(SO2) a colourless gas that smells of rotten eggs or burnt matches and is produced by...
the body system concerned with the digestion and absorption of nutrients.
highly addictive substance found in tobacco that accelerates the heart rate, and contracts and...