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found in the cell wall of xylem cells where the secondary cell wall is absent but the primary cell wall is present. They allow lateral movement of water within the plant.
the transfer of pollen from the anther to the stigma of the same plant (self-pollination) or of...
the excessive growth of algae in eutrophic streams, rivers and dams.
a pure substance made of only one type of atom. An element cannot be broken down into simpler...
cup-shaped sac at the beginning of the nephron, which surrounds the glomerulus.