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meristem that produces a layer of bark on the outer surface of a plant.
atmospheric gases, especially carbon dioxide, methane, nitrous oxide, ozone and water vapour,...
a response of the body tissues to injury or irritation. It causes pain, swelling, redness and...
simple chemical substances needed by the body in relatively small amounts for normal growth and...
an informal term for any living species which appears to be the same as a species otherwise only...