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a sac-like structure in plant cells that contains the cell sap. It supports the cell and helps maintain its shape.
the layer of fatty material that is usually only surrounds the axon of a neuron. It is made from...
a small, corky pore or narrow line on the surface of the stem of a woody plant that allows the...
the broad band of tissue in plant organs under the epidermis, including the parenchyma cells and...
the seepage of acidic, contaminated water from disused mines and mine dumps.