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substance that causes an allergic reaction.
the loss of water vapour from the aerial parts of a plant through stomata or lenticels.
pressure due to turgid (inflated) cells.
organisms that feed on dead organic matter and thereby release nutrients back into the soil.
the transfer of pollen from the anther to the stigma of the same plant (self-pollination) or of...
atmospheric gases, especially carbon dioxide, methane, nitrous oxide, ozone and water vapour,...