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the broad band of tissue in plant organs under the epidermis, including the parenchyma cells and the endodermis.
the difference between the concentrations of a specific molecule in two adjacent areas.
two species that interact symbiotically in a relationship that is beneficial to both species....
an infectious disease that is widespread in tropical and subtropical parts of the world and is...
simple inorganic chemical substances (mineral salts) that are needed in very small amounts for...