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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 outer region of the kidney, grainy in appearance, in which the Bowman's capsules of the...
cells that are formed during secondary growth by the vascular cambium ring just to the inside of...
an international agreement to phase out the use of CFCs, signed by 49 countries in Montreal,...
the main force responsible for the upwards movement of water in the xylem.
the site where a nerve impulse is transmitted from one neuron to the next. There is no physical...